Chafing, sweat, ride-up, and a drawer full of synthetics that shed microplastics—if your basics aren’t comfortable or considered, you feel it all day. Finding sustainable underwear for men can be tricky, too: materials and certifications vary, fits aren’t created equal, and plenty of brands talk “eco” without backing it up. If you’re in Australia and want pairs that breathe, last, and are made with people and planet in mind, you’re in the right place.
This 2025 guide rounds up the 10 best options available to Aussies now, from bamboo and organic cotton to hemp and merino—covering vegan picks as well. We’ve looked at fibre sourcing and credentials (think GOTS, Fairtrade, Ethical Clothing Australia), factory standards, durability, and real-world comfort features like pouch support and longer legs to stop ride-up. For each brand you’ll get who it’s best for, price ranges in AUD, sizes, and returns and shipping details in Australia, so you can compare quickly and buy with confidence. Ready to upgrade your top drawer, sustainably?
1. SLY Collective
Aussie-designed and purpose-built for comfort, SLY Collective’s bamboo boxer briefs tackle the big three—chafing, ride-up, and overheating—without sacrificing style. If you’re hunting for sustainable underwear for men that can keep up on long workdays, sweaty sessions, and red‑eye flights, this is a smart first stop.
Eco materials and credentials
SLY uses bamboo fabric for its natural performance and lower-impact profile. Bamboo requires fewer inputs than conventional cotton, with pest resistance, reduced water usage, minimal farming waste, and lower chemical run‑off, and it’s biodegradable at end of life. Designed in Australia with street-inspired details, the brand pairs function with a lighter footprint.
Fit, features and support
Built for all-day wear, these trunks centre on a supportive architecture that reduces friction and keeps everything in place. The result is a cooler, drier, chafe-free feel—especially welcome in Aussie heat and humidity.
- Built-in inner pouch: Separates and supports to stop skin-on-skin contact and chafing.
- Longer leg cut: Prevents ride-up and bunching under shorts or trousers.
- Temperature regulation: Breathable bamboo helps prevent overheating for comfort and testicular health.
- Nifty pocket: Discreet stash for keys, card, passport, or condoms—ideal for travel.
- Structured support: Holds shape through movement for running, lifting, or commuting.
Who it’s best for
If you run hot, rack up steps, or battle thigh rub, SLY’s pouch plus longer leg combo is a game changer. It suits:
- Active guys: Gym, sport, and long shifts.
- Frequent travellers: Pocket practicality and odour-managing fabric.
- Chafe-prone men: Reliable separation to reduce irritation.
- Comfort purists: Want one pair that does it all, sustainably.
Price range (AUD)
Positioned alongside premium bamboo boxer briefs. Check the site for current AUD pricing and any multi-pair savings.
Sizes, returns and shipping in Australia
Expect a standard men’s size run; refer to the brand’s size guide for the best fit. SLY backs comfort with customer-first policies in Australia:
- Comfort Guarantee: Full refund on your first pair if it’s not comfortable.
- Free exchanges: Hassle-free size swaps.
- Free shipping: On orders over $100 within Australia.
2. Bhumi
Bhumi is a go-to for guys who want soft, breathable organic cotton with serious ethics behind it. The Australia-based label prioritises traceable fibres and fair treatment across its supply chain, so you’re not just buying comfortable basics—you’re backing better standards with every pair.
Eco materials and credentials
Bhumi uses certified organic cotton with Fairtrade credentials across its range, and the brand is vegan-friendly. It’s rated “Great” by Good On You, reflecting strong performance for people and planet. If you’re seeking plastic‑free, lower-impact, sustainable underwear for men, Bhumi’s organic approach keeps things simple and skin-friendly.
Fit, features and support
Built for everyday wear, Bhumi’s men’s styles include boxer briefs and trunks in easy, no-fuss cuts. Organic cotton delivers natural breathability and softness for all-day comfort, with a supportive feel that stays comfortable under jeans, workwear or gym gear.
- Organic comfort: Breathable, soft-hand feel for daily wear.
- Everyday cuts: Boxer briefs and trunks for reliable coverage.
- Made to last: Quality fibres and construction for repeat wash and wear.
Who it’s best for
- Cotton purists: Prefer natural fibres against the skin.
- Sensitive skin: Gentle organic cotton with no nasty inputs.
- Ethics-first buyers: Want Fairtrade and a “Great” rated brand.
Price range (AUD)
Fairly priced for certified organic, Fairtrade cotton, with value-friendly multipacks available. Check current pricing and promos on the brand’s site.
Sizes, returns and shipping in Australia
- Sizes: XS–XL (men’s).
- Returns: Free 30‑day returns noted on the range.
- Shipping: Ships locally from Australia with Australia‑wide delivery; see checkout for rates and timeframes.
3. Boody
If you want easy-wear, planet-friendlier basics you can throw on every day, Boody is hard to beat. Founded in Australia and rated “Good” by Good On You, the brand makes soft, breathable men’s briefs, boxers and trunks from organically grown bamboo, prioritising comfort without the eco greenwash.
Eco materials and credentials
Boody builds its range with bamboo that’s organically grown, then processed in a closed-loop system to help capture and reuse solvents. The brand also reduces waste with lower‑waste cutting. That combination of better fibres and smarter production underpins Boody’s credentials as a solid pick for sustainable underwear for men.
Fit, features and support
Boody’s cuts are designed for everyday comfort: supportive where you need it, zero fuss everywhere else. The fabric’s natural breathability helps keep you cool on warm days and comfortable under workwear or denim, while the smooth feel is kind to skin.
- Ultra-soft hand feel: Comfort-first bamboo viscose against the skin.
- Breathable, temperature friendly: Helps you stay cool and comfortable.
- Everyday support: Reliable waistband and gentle stretch for a stay-put fit.
- Low-bulk finish: Easy layering under jeans, chinos or gym gear.
Who it’s best for
- Everyday minimalists: Want simple, comfortable pairs that just work.
- Sensitive skin: Prefer smooth, gentle fabrics with fewer irritants.
- Eco-minded shoppers: Looking for a “Good” rated Aussie brand using bamboo.
Price range (AUD)
Accessibly priced for bamboo basics with value in multipacks. Check Boody’s site for current AUD pricing and promos.
Sizes, returns and shipping in Australia
- Sizes: XS–4XL (men’s range noted).
- Returns: 30‑day returns are offered.
- Shipping: Ships from Australia with Australia‑wide delivery; see checkout for local rates and timelines.
4. Mighty Good Basics
Sydney-born and values-led, Mighty Good Basics keeps it simple: make comfortable, durable, sustainable underwear for men with honest materials and ethics you can stand behind. Designs are created and shipped from the brand’s Sydney office, while production happens in a small-scale, ethical factory in India.
Eco materials and credentials
The range is made from GOTS certified organic cotton with a small amount of elastane for stretch—so you get breathable, skin-friendly fabric without the nasties of conventional cotton. The brand’s mission is straightforward, too: build the world’s most ethical underwear by choosing low‑impact fibres and transparent, fair production.
Fit, features and support
Cut for everyday comfort, these basics prioritise softness, breathability and hold—whether you’re at a desk, on-site, or on the move. The elastane content helps the fabric recover between wears and washes, while the organic cotton keeps things cool and comfortable against the skin.
- Organic comfort: Soft, breathable GOTS cotton where it matters most.
- Everyday stretch: A touch of elastane for shape retention.
- Quality make: Small-scale, ethical production focused on longevity.
Who it’s best for
- Ethics-first buyers: Want organic fibres and an ethical factory partner.
- Cotton purists: Prefer the feel of natural fibre against skin.
- Minimalists: Clean, no-fuss silhouettes that work with any kit.
Price range (AUD)
Fairly priced for certified organic cotton basics. Check the brand’s site for current AUD pricing and any bundle savings.
Sizes, returns and shipping in Australia
Expect a standard men’s size run; use the size guide for accuracy. Designed and shipped from Sydney with Australia‑wide delivery. For the latest on returns and shipping rates or timeframes, confirm at checkout or on the brand’s policy pages.
5. Underwear for Humanity
If you’d rather back a homegrown label that puts sustainability front and centre, Underwear for Humanity is one to put on your list. The brand markets sustainable underwear in Australia and keeps things simple at checkout with a clearly stated $10 delivery, making cost and carbon a little easier to manage when you’re restocking basics.
Eco materials and credentials
Underwear for Humanity presents itself as a sustainability-first option. When comparing styles, prioritise fibres and proofs over marketing copy: look for certified organic cotton, bamboo-based blends, and third‑party credentials (for example, recognised organic or fair trade standards) called out on individual product pages. This is the fastest way to ensure you’re actually getting sustainable underwear for men rather than just green talk.
- Quick fabric checklist: Organic cotton, bamboo-derived fibres, low‑impact dyes; verified by independent standards where available.
Fit, features and support
For everyday comfort, focus on cuts that reduce friction and stay put. Boxer briefs with a longer leg help prevent ride‑up, while a soft, secure waistband and flat seams minimise irritation under jeans or workwear. Breathable knits will keep you cooler across long, warm Aussie days.
- What to prioritise: Longer leg, flat seams, breathable knit, reliable waistband.
Who it’s best for
- Values-led shoppers: Want to support an Australian sustainability-focused label.
- Everyday comfort seekers: Prefer breathable, low‑irritation pairs for work, travel and weekends.
- Switchers from synthetics: Looking to cut down on plastic-heavy basics.
Price range (AUD)
Pricing varies by fabric and style. Check current AUD pricing and any bundle offers on the brand’s site to get the best value.
Sizes, returns and shipping in Australia
Confirm sizing with the brand’s size guide for an accurate fit. Shipping within Australia is listed at $10 delivery, which keeps things predictable. Review the latest returns policy on-site before you buy to understand windows and conditions.
6. Step One
Born in Australia and built for comfort, Step One focuses on chafe-free performance using bamboo‑derived fabrics and clever construction. With over 50k five‑star reviews to its name, the brand has become a go‑to for guys who want sustainable underwear for men that actually solves thigh rub and daily discomfort.
Eco materials and credentials
Step One’s men’s range is made from viscose derived from bamboo, a plant‑based fibre prized for its softness and breathability. Opting for bamboo viscose helps reduce reliance on virgin synthetics and keeps things cooler and more comfortable through long, hot Aussie days.
- Plant‑based fabric: Viscose made from bamboo for a softer, breathable feel.
- Lower‑impact choice: A practical step away from plastic‑heavy basics.
Fit, features and support
The hero here is friction control. Step One pairs super‑soft bamboo viscose with its Ultraglyde™ technology to minimise thigh rub and help your underwear stay comfortable under jeans, workwear or gym kit. The result is an easy, supportive fit that holds up to movement and heat.
- Ultraglyde™ anti‑chafe panels: Designed to cut friction where it counts.
- Soft, breathable knit: Helps manage heat and moisture.
- Supportive everyday fit: Stays comfortable from commute to cooldown.
Who it’s best for
- Chafe‑prone thighs: Need reliable anti‑friction performance.
- Active days and warm climates: Breathable fabric for workouts and summer.
- Switchers from synthetics: Want softer, plant‑based comfort.
Price range (AUD)
In line with premium bamboo basics, with value in multipacks. Check current AUD pricing and bundle offers on the brand’s site.
Sizes, returns and shipping in Australia
Step One offers a broad men’s size run; use the size guide to dial in fit. Expect Australia‑wide delivery with rates and timelines shown at checkout. Review the brand’s returns policy online for windows and conditions before you buy.
7. Bushy Underwear
Bushy keeps things close to home with fitted boxers that are ethically made in Australia from sustainably sourced TENCEL Lyocell. If you’re after sustainable underwear for men that’s simple, breathable and locally made, Bushy’s tight edit hits the brief without the bells and whistles.
Eco materials and credentials
Bushy uses TENCEL Lyocell—a natural cellulose fibre made from eucalyptus—with a small amount of elastane for comfortable stretch. Production is certified by Ethical Clothing Australia, so you can buy knowing the making of your undies is independently audited for fair Australian manufacturing.
- TENCEL Lyocell: Eucalyptus‑based fibre with a smooth, breathable hand feel.
- Ethical Clothing Australia: Verified Aussie-made and ethically produced.
Fit, features and support
These are fitted boxers designed to sit close without squeezing, helped by that touch of elastane. The lightweight TENCEL fabric lends a cool, smooth feel under jeans or workwear, while the streamlined cut keeps bulk down and comfort up for all‑day wear.
- Fitted cut: Streamlined pattern for a neat, supportive feel.
- Light stretch: Elastane adds recovery through movement and washes.
- Low-bulk comfort: Smooth finish that layers cleanly under any kit.
Who it’s best for
- Buy‑local advocates: Want ethically made in Australia with ECA certification.
- Hot‑weather wearers: Prefer cool, breathable TENCEL for long days.
- Minimalists: Two colour options and a fuss‑free silhouette.
Price range (AUD)
Priced in line with premium, locally made TENCEL basics. Check the brand’s site for current AUD pricing and any bundle offers.
Sizes, returns and shipping in Australia
Expect a standard men’s size run; consult Bushy’s size guide for best fit. The brand offers 30‑day returns, and ships Australia‑wide—see checkout for delivery rates and timelines.
8. Etiko
If you want your dollars to back real change as well as comfort, Etiko is a standout. The Victorian brand consistently pushes human rights and fair pay in traditionally exploitative supply chains, pairing that commitment with breathable organic cotton trunks that feel good from first wear. It’s a reliable pick when “sustainable underwear for men” means ethics you can actually verify.
Eco materials and credentials
Etiko’s men’s underwear is made from Fairtrade and organic cotton, produced in a factory in India certified by Fair Trade USA that demonstrates payment of a living wage. The brand is certified B‑Corp and is rated “Great” by Good On You—top marks that reflect strong performance for people and planet.
- Fairtrade organic cotton: Lower‑impact fibre with traceable standards.
- Fair Trade USA certified factory: Independent oversight and living wage.
- B‑Corp + “Great” rating: Third‑party validation of ethics and impact.
Fit, features and support
Etiko keeps the design clean and functional: soft organic cotton for breathability, a supportive cut that stays put under jeans or workwear, and quality construction built to handle repeat wash and wear. Expect everyday comfort without flashy gimmicks.
- Breathable knit: Natural fibre comfort for long days.
- Supportive cut: Stay‑put fit with a soft waistband.
- Durable make: Built for regular rotation.
Who it’s best for
- Ethics‑first buyers: Want Fairtrade, living wage and B‑Corp credentials.
- Cotton purists: Prefer natural fibre against the skin.
- Sensitive skin: Gentle organic cotton with fewer irritants.
Price range (AUD)
Accessible for certified Fairtrade organic cotton basics. Check current AUD pricing on Etiko’s site for the latest styles and any offers.
Sizes, returns and shipping in Australia
Etiko offers standard men’s sizing—use the size guide to nail the fit. Orders ship from Australia with Australia‑wide delivery (international shipping also available). Confirm shipping rates, timelines and the latest returns window on the brand’s policy pages before you buy.
9. Thunderpants (NZ)
Crossing the ditch for colour and conscience, Thunderpants brings fun prints and lasting comfort to sustainable underwear for men. Family‑owned and based in New Zealand’s Wairarapa region, the brand focuses on sturdy, skin‑friendly fabric and simple cuts that hold up to years of wear—ideal if you want natural fibres without the fuss.
Eco materials and credentials
Thunderpants builds its men’s range from organic and Fairtrade cotton, prioritising fibre integrity and longevity over gimmicks. That combination delivers breathable comfort with the assurance that the cotton has been grown and traded to recognised ethical standards, all from a family outfit rooted in regional New Zealand.
Fit, features and support
Think everyday reliability with personality. The soft yet sturdy knit provides natural breathability and a reassuring, supportive feel, while the brand’s signature graphic prints keep things lively without sacrificing durability. Cuts span briefs and boxers, with coverage that stays comfortable under jeans, workwear or gym gear.
- Soft, sturdy organic cotton: Gentle on skin, built to last.
- Everyday cuts: Briefs and boxers for dependable coverage.
- Prints that endure: Fun patterns designed to withstand repeat wash and wear.
Who it’s best for
- Cotton purists: Prefer natural fibres against the skin.
- Print lovers: Want bold patterns without compromising ethics.
- Durability seekers: Need undies that keep their shape and colour.
Price range (AUD)
Mid‑range for Fairtrade organic cotton basics. Confirm current AUD pricing at checkout for the most accurate conversion.
Sizes, returns and shipping in Australia
Expect standard men’s sizing—use the brand’s size guide to fine‑tune your fit. As a New Zealand brand, review the site for current Australian delivery options, rates and timelines, and check the returns policy for window and condition details before you buy.
10. Merino Country
Merino Country keeps it authentically Aussie with basics made from high‑quality Australian merino wool. Founded by former sheep farmers, the brand focuses on simple, hard‑wearing briefs and boxers that feel good against the skin and stand up to daily wear. Better still, garments are ethically made in the brand’s own Queensland factory for added oversight and accountability.
Eco materials and credentials
Merino is a natural, renewable and biodegradable fibre, valued for comfort and longevity. Merino Country leans into those strengths with Australian wool and local manufacturing, cutting transport miles and keeping skilled making onshore in Queensland. If you want sustainable underwear for men that swaps synthetics for nature, this is a strong, homegrown option.
- Australian merino wool: Known for softness, breathability and year‑round comfort.
- Ethically made in Queensland: In‑house production for transparent, local making.
Fit, features and support
Expect straightforward, reliable cuts in briefs and boxers that prioritise comfort over gimmicks. The merino knit delivers a smooth, breathable feel under jeans or workwear, with natural odour management and temperature friendliness that helps across long days and warm climates.
- Comfortable everyday cuts: Supportive without bulk.
- Merino performance: Naturally helps with breathability and odour.
- Built to last: Quality fabric and make for repeat wash and wear.
Who it’s best for
- Buy‑local advocates: Prefer Aussie‑made with ethical in‑house production.
- Natural fibre fans: Want merino’s comfort instead of plastic‑heavy blends.
- Travel and work days: Appreciate breathable, low‑odour performance.
Price range (AUD)
Pricing reflects premium Australian merino and local manufacturing. Check the brand’s site for current AUD prices and any multipack value.
Sizes, returns and shipping in Australia
Merino Country offers standard men’s sizing—use the size guide for accuracy. Orders ship Australia‑wide from Queensland; review delivery options and timelines at checkout. Check the returns policy online for the latest window and conditions before you buy.
The bottom line
The right pair disappears from your mind—no chafing, no ride‑up, no overheating—just all‑day comfort you don’t have to think about. Whether you’re a cotton purist, a bamboo convert, a hemp advocate or a merino fan, the brands above cover the bases with better fibres, solid construction and credible standards like GOTS, Fairtrade and Ethical Clothing Australia. Start with your needs: breathable knit, longer legs, pouch support, and a fit that stays put through your day.
Buy smart, too: try a single pair before you bundle, wash cold and line‑dry to make them last, and back labels that prove their claims. If you want chafe‑free support with a built‑in pouch and a handy stash pocket, check out SLY Collective—Aussie‑designed bamboo trunks with comfort guarantees and local shipping. Upgrade your top drawer and feel the difference every day.