Size guide

SULLIOS briefs fit by your waist and are cut true to size. Find your size in seconds, or use the chart below.

Find your size
32 in
Mtrue to size — clean, secure fit

Size chart

SizeWaist (inches)Waist (cm)
S28–30″71–76 cm
M31–32″79–81 cm
L33–34″84–86 cm
XL35–36″89–91 cm

How to measure: wrap a tape around where your briefs sit — no tape? Use the W number on your jeans. Between sizes? Size up for relaxed, down for snug.

The detail

Engineered in every stitch

SULLIOS Originals detail
The fabric

From nets to next summer

We start with discarded fishing nets and ocean-bound plastic, regenerated into a premium performance yarn — then knit it into a soft, supportive, chlorine-ready fabric that’s made to last.

Recycled performance yarnUPF 50Chlorine resistant
Recycled fabricOcean-bound plastic
4-way stretchMoves with you
UPF50Blocks 98% UV
Quick-dryDries in minutes
Chlorine-resistantHolds colour
LinedFront or full, by style
Make them last

A little care goes a long way

We make our briefs to last — and looking after them keeps the colour rich and the fit true, season after season. It’s also the most sustainable thing you can do: the longer they last, the less ends up in landfill. Here’s all it takes.

Hand / cold wash30°C max
Don't bleachNo chlorine bleach
Don't tumbleAir dry only
Don't ironNot needed
Line dry, shadeOut of direct sun

Fit questions

Size up for a relaxed fit, or down for a snug one. Our cut is true to size, so most people stay on their measured size.
The recycled fabric has 4-way stretch and recovery, so they move with you but spring back — they won't bag out.
Chlorine-resistant fabric is tested to 200+ hours of pool use. Rinse after every swim and they'll hold colour and shape for seasons.
Yes — Originals are front-lined and Printed styles are fully double-lined, both opaque and supportive with a clean 6cm cut.
No. The chlorine-resistant fabric and shade-drying keep colours rich season after season.
Our models are around 6'1" / 185cm and wear a M. Heights and sizes are listed on each product page.
Where are you swimming?

Check the water before you pack

Tell us your destination — we’ll give you the water temp and the right pair.

Water
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Air
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Did you know
Most French public pools ban board shorts for hygiene — briefs only. Oui chef.