Size Guide
Size guide
Get it right the first time.
Hello Slim runs true to size. Measure your natural waist once, order once — and if it is still wrong, the right size goes out free and you keep the first box.
Find your size
| Size | Waist (in) | Waist (cm) | Typically fits |
|---|---|---|---|
| M | 30–32" | 78–86 cm | 60–72 kg / 132–159 lb |
| L | 33–35" | 86–94 cm | 72–84 kg / 159–185 lb |
| XL | 36–38" | 94–104 cm | 84–96 kg / 185–212 lb |
| XXL | 39–41" | 104–114 cm | 96–110 kg / 212–243 lb |
The weight column is a rough guide only. Waist measurement decides the size — two men at the same weight can be two sizes apart.
Measuring
Three steps, one minute
Find your natural waist
Not where your trousers sit — the narrowest part of your torso, roughly level with your navel.
Wrap the tape level
All the way round, parallel to the floor, snug but not pulled tight.
Breathe out and read it
Normally. Do not hold your stomach in — you will size down and regret it by the second wash.
No tape measure? Take a belt you wear comfortably and measure from the buckle pin to the hole you actually use.
Between two sizes? Take the larger one.
The 5% elastane is already pulling the brief in to fit you. Forced further, the waistband digs, the leg grips, and the cotton does not stretch back out. It stays that way.
A brief that starts slightly generous settles into shape after two washes and stays comfortable for the life of the pair. This is the one to pick.
So: measure 35.5" and you take XL, not L.
The waistband
Flat on the waist, no roll, no dig. You should slide two fingers under it without strain.
The leg
Ending mid-thigh, holding without gripping. A mark after an hour means you are one size down from where you should be.
The front
Knitted without a seam and with no fly opening. Nothing should press or bunch anywhere.
Every pair in the box is your size
You choose the size, not the colours. A 6-Pack is one pair in each of the six colours; a 12-Pack is two of each. All of them arrive in the single size you select at checkout.
Still not sure?
Send us your waist measurement and tell us whether you like things snug or relaxed. We will tell you which size to take, usually the same day.
If the size is wrong, keep the box.
Email us within thirty days and the right size goes out free. You do not post the first one back — the postage would cost more than the boxers.