Your Fit. Your Rules.
SLY Size Guide
No guessing. No returns. Just the right fit — first time.
Getting the right size isn't rocket science, but getting it wrong is a genuine pain in the arse. SLY underwear is engineered for fit — the pouch needs to sit right, the waistband needs to hold firm, and the whole lot needs to move with you, not against you. Spend 60 seconds with this guide and you'll be sorted.
How to Measure Up
Grab a Tape Measure
Get a flexible measuring tape — the kind a tailor uses. Not a ruler, not a piece of string. An actual fabric tape.
Measure Your Waist
Wrap the tape around the narrowest part of your waist, roughly 2–3 cm above your belly button. Keep it level, keep it snug — and don't hold your breath.
Measure Your Hips
Wrap the tape around the fullest part of your hips and backside. Feet together, standing straight. Note the number down.
Cross-Check the Chart
Find your waist below. Sitting between two sizes? Always size up — SLY is built to hug, not strangle.
Men's Underwear Size Chart
All measurements in centimetres (cm) and inches (in). When in doubt, size up.
| SLY Size | Waist (cm) | Waist (in) | Hip (cm) | Hip (in) | AU Clothing |
|---|---|---|---|---|---|
| XS | 70–75 | 27½–29½″ | 76–81 | 30–32″ | XS |
| S | 75–80 | 29½–31½″ | 81–86 | 32–34″ | S |
| M | 80–85 | 31½–33½″ | 86–91 | 34–36″ | M |
| L | 85–90 | 33½–35½″ | 91–96 | 36–38″ | L |
| XL | 90–95 | 35½–37½″ | 96–101 | 38–40″ | XL |
| 2XL | 95–100 | 37½–39½″ | 101–106 | 40–42″ | 2XL |
| 3XL | 100–105 | 39½–41½″ | 106–111 | 42–44″ | 3XL |
Fit Notes by Style
Pouch Underwear
The pouch is the main event. It's engineered to separate and support without squishing. If your waist sits right on the border of two sizes, go up — the pouch needs room to do its thing properly. Shop Pouch Underwear →
Pocket Underwear
Snug but not restrictive. The phone pocket sits flat and stays put. If you're between sizes, size up to keep the pocket accessible without the waistband pulling. Shop Pocket Underwear →
Quick-Dry Underwear
Our quick-dry fabric carries a touch of stretch and moves with you. True to size across the board — if you're at the top of your size bracket and active, size up for max comfort. Shop Quick-Dry →
Black Bamboo Range
Proudly made in Australia from natural bamboo fabric. Holds its shape well and softens beautifully with every wash. Size true — by the third wash it'll feel like a second skin. Prefer a relaxed feel? Size up.
International Sizing — Where We Stack Up
Ordering from the US, UK, or Europe? Here's how SLY sizes compare across the major markets.
| SLY Size | Australia (AU) | USA (US) | United Kingdom (UK) | Europe (EU) |
|---|---|---|---|---|
| XS | XS | XS | XS | 42–44 |
| S | S | S | S | 44–46 |
| M | M | M | M | 46–48 |
| L | L | L | L | 48–50 |
| XL | XL | XL | XL | 50–52 |
| 2XL | 2XL / XXL | XXL | XXL | 52–54 |
| 3XL | 3XL / XXXL | XXXL | XXXL | 54–56 |
Got Questions? We've Got Answers.
What if I'm between two sizes?
Size up, always. SLY underwear is built to be snug but not restrictive. Going up a size means the waistband won't dig in after lunch and the pouch has room to do its job properly.
Do SLY sizes run true to size?
Yep. Our underwear is engineered to Australian sizing standards. If you normally wear a Large in quality men's underwear, you'll wear a Large with SLY. No funny business, no sizing games.
Will the fabric stretch out after washing?
SLY fabrics are pre-shrunk and wash-stable. Bamboo and microfibre blends soften with wear but hold their shape. Wash cold, hang to dry — job done.
What's your returns policy if the size isn't right?
We stand behind the fit. Browse our full range, or head to our About page to reach the team — we'll get you sorted.
Which style should I start with?
If you've never tried pouch underwear, the Men's Pouch Range is the obvious first move. If you're active or travel a lot, go Quick-Dry. Need pockets? You know where to look.
Got Your Size? Let's Go.
Pouch underwear, pocket styles, quick-dry options — all engineered for the way men actually live.