10%
off
$
100
·
20%
off
$
200
·
free
$
50
·
Frequently Asked Questions
Why do I need a pair?
If you prefer to wear underwear beneath your swimsuit, make it Amphibious. It’s designed specifically to be worn under your board shorts or trunks for extra support—with soft, smooth Nylon Aquarius™ fabric to prevent chafing.
Are they covered under your Try on Guarantee?
Yes, your first pair is covered. If you don’t love it, we'll send you a different size or issue you a full refund—no return required.
EVERY DETAIL MATTERS
|
SIZE CHART
SIZE
S/M
M/L
L/XL
XL/XXL
WAIST (in)
- 28" - 32"
- 32" - 36"
- 37" - 40"
- 41" - 45"
TRY ON GUARANTEE
If you don't love your first pair, we'll send you a different size, style or issue a refund - you can even keep the pair you tried on.
Size Chart
SIZE
S/M
M/L
L/XL
XL/XXL
WAIST (in)
- 28" - 32"
- 32" - 36"
- 37" - 40"
- 41" - 45"
Try On Guarantee
If you don't love your first pair, we'll send you a different size, style or issue a refund - you can even keep the pair you tried on.
Mack Weldon is reinventing men’s basics
We believe in smart design, premium fabrics, and simple shopping
