Choose Your Pool Perfect Combo

PERIOD STRESS AT SWIM SQUAD, A MEET OR THE BEACH? Hard pass.

UnderSwim OG is period swim underwear worn beneath full-bottom swimwear. It period-proofs the swimsuit you already own without adding bulky seams or an obvious periodwear silhouette.

Its integrated protection absorbs up to 20 ml of menstrual flow, around four regular pads’ worth, while a sealed, impenetrable barrier locks flow in and helps keep pool or sea water out.

The seamless OG fit disappears beneath training swimmers, race suits and regular-coverage bikini bottoms. Menstrual protection: handled. Awkward outlines: not invited.

OFFICIAL PERIOD-SAFE SWIM UNDERWEAR OF SWIMMING AUSTRALIA.

UnderSwim is compliant for USA Swimming Age Group Competitions under Rule 205.10.1. Period underwear is also permitted under Swim England guidance for training and eligible Swim England competitions, subject to the applicable event rules.

• Reusable period-proof swimwear layer worn beneath full-bottom swimwear
• Up to 20 ml absorbency, around four regular pads’ worth
• Seamless, no-show OG fit
• Water-resistant outer coating and chlorine-resistant performance fabric
• PFAS-free and OEKO-TEX® STANDARD 100 certified for safety
• Girls’ sizes G10-12, G12-14 and G14-16
• Women’s sizes W10-W18
• Black, Neutral and Navy

Water blocked. Period locked. Swim still happening.

Explore period swimwear by need

Find practical guidance for Para and Multi-Class swimmers, competitive swimmers and tech suits, sailing and water sports, or browse all period swimwear advice.

PERIOD STRESS UNDER A HIGH-CUT SWIMSUIT? Hard pass.

UnderSwim G-Fit is period-proof swim underwear designed to disappear under high-cut swimsuits, racing suits and bikini bottoms.

Its seamless high-leg cut gives you a discreet layer beneath the swimwear you already want to wear.

Up to 15 ml absorbency is around two tampons’ worth of protection, without bulky seams or a waterlogged feel.

A water-resistant outer helps keep pool and sea water out. Four thin absorbent layers lock menstrual flow in. No wet-nappy energy.

• Invisible under high-cut swimwear, including one-piece, racing and bikini styles
• Seamless high-leg fit in Black or Neutral
• Up to 15 ml absorbency, around two tampons’ worth
• Water-resistant and chlorine-resistant
• Compliant with Swimming Australia’s Inclusive Swimwear Policy
• USA Swimming compliant for Age Group Competitions under Rule 205.10.1
• Swim England compliant
• PFAS-free and OEKO-TEX® STANDARD 100 certified for safety
• Girls’ sizes G10-12, G12-14 and G14-16; women’s sizes W10-W18

UnderSwim G-Fit is the discreet period layer for swimmers who want the protection underneath and the swimwear on show.

Explore period swimwear by need

Find practical guidance for Para and Multi-Class swimmers, competitive swimmers and tech suits, sailing and water sports, or browse all period swimwear advice.