Story
Part swim trunk, part active short, cut from a 4-way stretch fabric with an ultra-soft performance liner
The same Wellen trunk you put through its paces is now part of the Proof family, and newly updated with a hidden side-zip pocket. It's two shorts in one; we took our favorite swim shorts and all-day active shorts and combined them to create the perfect short for all-day adventures in and out of the water. We’re talking 4-way stretch fabric to power everything from longboard sessions to yoga to surf ‘n turf workouts, an ultra-soft liner used by elite triathletes, and everyday carry pockets. And thanks to the versatile style and modern fit, it looks great with slides and a short sleeve button down to pull double duty for a concert or date night. We call it the swim trunk killer.
Features
- Modernized classic fit with a comfortable elastic waistband and drawcord
- 7" inseam with four-way stretch fabric for surfing, paddling, stretching, and training
- Made from recycled poly (water bottles) and spandex with UPF 50+ protection
- Ultra-soft, quick-dry liner (inspired by performance bike bibs) with hidden phone pocket
- Mesh-lined side pockets with hidden AirPods sleeve
- Back snap pocket with key bungee and reflective hit, plus a new hidden side zip pocket
Sizing
- The Performance Lined Swim Trunks run true to size. Order your standard pant or short size.
- Still not sure what size to buy? Grab a pair of shorts at home to compare to the garment measurements below:
Garment Measurements
|
XS |
S |
M |
L |
XL |
XXL |
| Waist |
28¼ |
30¼ |
32½ |
34½ |
37 |
40 |
| Thigh |
12½ |
13 |
13½ |
14⅛ |
14⅞ |
15⅝ |
| Leg Opening |
10¼ |
10⅝ |
11 |
11½ |
12⅛ |
12¾ |
| Inseam |
7 |
7 |
7 |
7 |
7 |
7 |
All measurements are in inches.
How to Measure
- Waist: Align the front and back waistbands so they’re stacked on top of each other, then measure from edge to edge across the middle of the waistband, multiply by 2
- Thigh: Starting 1" below the crotch seam, measure straight across from edge to edge (not from seam to seam)
- Leg Opening: Measure across the bottom hem from edge to edge
- Inseam: Measure from the crotch seam down to the bottom of the leg hem, following along the inside of the leg
Materials & Care
- 4-way Stretch Fabric made from 92% recycled polyester (keeping plastic water bottles out of the ocean) and 8% spandex
- “Air Conditioning” Liner made from 90% polyester and 10% spandex
- Made in Vietnam
- Machine wash cold. Wash inside out. Do not bleach. Tumble dry low.
About Proof
Sprint and catch that train. Bike to your next meeting. Stretch out on that international flight. Thanks to innovative technical fabrics and thoughtful design, Proof’s smart, technical apparel rises to every occasion. Designed for work, play, and travel, Proof updates everyday essentials with the latest performance fabrics and construction techniques to help you get more out of your clothing — so you can get more out of yourself.
The Sweat Test Guarantee
Put your new Proof gear through its paces. If it does not meet your expectations, we'll accept your dirty laundry and issue a refund, no questions asked.
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