Warm sand, salty hair, shells in your pockets.

Meet Ultramarine — soft, breathable, perfect for summer..

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10,000+ 5-Star Reviews

OEKO-TEX® certified

PFAS-Free

B-Corp certified

Shop Multi-Packs

| Black Denim Shale
Sale

3-Pack Super Boxer

3-Pack Super Boxer
$82.50 USD $165.00 USD

    • Good Things Come in Threes

    Multi-packs available now,
    the easiest way to stock your drawer for less.

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    Technical Organic Cotton

    Leakproof underwear built with a moisture-wicking organic cotton gusset engineered to reduce odour and keep you dry.

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    Compare Our Leakproof Systems

    Essential

    Moderate coverage

    Boost™

    Adjustable coverage

    Super

    Heavy coverage
    | Ultramarine
    Sale

    Essential Thong

    Essential Thong
    $20.40 USD $34.00 USD

    • 10,000+ 5 Star Reviews

    At the forefront of leakproof design since 1993.

    Soft, breathable and no leaks!

    — Robin T.

    Perfect amount of protection

    — Natalie F.

    Great for overnight

    — Zoe L.

    High quality, super absorbent, and barely noticeable

    — Riley

    My last pairs lasted 7 years!

    — Gill D.

    Body-mapped designs

    Explore different rises and coverage

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    Boxers

    Available in 4 absorbencies
    Hipsters

    Available in 4 absorbencies
    Thongs

    Available in 1 absorbency
    | Espresso
    Briefs

    Available in 4 absorbencies

    Heavy + Overnight Protection

    Designed with longer and wider front-to-back gusset coverage for leakproof coverage you can count on.

    SHOP BOXERS OUR TECH

    Our Approach

    Since 1993, we've been making high-performance underwear that supports the people who wear it, respects the people who make it, and protects the planet it comes from.

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    SUPER

    Best for

    Heavy flow & overnight for a leak free sleep

    Features

    Dual-layered gusset for extra absorbency. Boxers with front, back & down the leg coverage

    Available styles

    Boxer & Hipster

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    BOOST™

    Best for

    Change your absorbency, not your underwear with our easy-swap BOOSTER™

    Features

    Removable BOOSTER™ allows you to customize absorbency to fit your needs in the moment

    Available styles

    Boxer, Hipster, Brief

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    ESSENTIAL

    Best for

    Soft lightweight protection for moderate flow

    Features

    Ultra thin, absorbent gusset feels just like regular underwear

    Available styles

    Boxer, Hipster, Brief, Thong

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    Black

    PADS

    Best for

    Comfortable, affordable protection you can rely on

    Features

    Soft cotton gusset with quick-absorbing layers & edge-to-edge leak protection

    Available styles

    Mini, Maxi & Super Pad, Liner, Extended Liner

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    Related products

    Leakproof Swimwear

    Built to catch and lock-in those sneaky leaks that occur before and after you swim.

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    Mystery Bundles

    Curated selections of our best-selling leakproof period underwear.

     SHOP BUNDLES

    Made for Humans, By Humans

    OEKO-TEX® certified

    Our fabrics are certified free from harmful substances, gentler on skin, safer for long-term wear, ultimately, reducing irritation.

    Stitched, not glued

    Stitched seams hold up through 100+ washes. Bonded (glued) construction stretches out and breaks down over time.

    PFAS-Free*

    No PFAS or unnecessary chemical treatments in our leakproof layers, designed to be safe against your skin.

    PROVE IT.