Leakproof Bikini
Leakproof Bikini
Leakproof Bikini
Leakproof Bikini
Leakproof Bikini
Leakproof Bikini
Leakproof Bikini
Leakproof Bikini
Leakproof Bikini

CORE:TX™

Leakproof Bikini

$32
4.7
Rated 4.7 out of 5 stars
288 Reviews
Absorbency Medium
Light
Medium
Heavy

Size

Size Guide

Item is in stock Only 0 left in stock Item is out of stock Item is unavailable

Thin and lightweight, the CORE:TX™ 5.0 gusset provides medium absorption and all-day comfort with protection for moderate flows. Wear it for your long day of work, or for your evening spin class. Designed to ensure comfort that adapts to your every move.

Mid-rise, moderate coverage with a waistband that rests below the natural waistline. Fits snug at first but conforms to your body with wash and wear.

Model is 5'8"/173cm wearing a size S.

Wash with like colours. Hand wash or machine wash in cold water. Avoid washing at high temperatures to prevent peeling of adhered fabric. Do not use bleach or fabric softeners. Use wash bag. Do not tumble dry.

Body: 71% Nylon, 29% Spandex
CORE:TX™ 5.0 Gusset Layer 1: 91% Polyester, 9% Spandex
CORE:TX™ 5.0 Gusset Layer 2: 89% Polyester, 11% Spandex
CORE:TX™ 5.0 Gusset Layer 3: 71% Nylon, 29% Spandex, PU Film

Experience CORE:TX™ Leakproof Underwear with confidence—enjoy a 45-day money-back guarantee.*

How It Works:

  1. Choose Your Style: Add a single pack of CORE:TX™ Leakproof Underwear to your cart - available in Bikini, Boyshort, High Rise, or Thong, in any size and absorbency.
  2. Checkout: Complete your single pack order with Standard or Expedited shipping.
  3. Try It: Experience the comfort, quality, and convenience of our CORE:TX™ Leakproof Underwear.
  4. Get a Refund: If unsatisfied, request a refund (excluding shipping) within 45 days of receiving your order through our Return Center or by contacting us at hello@athleticus.com. You keep the underwear.

*Terms and conditions apply. EXCLUDED: Purchases of CORE:TX™ Leakproof Activewear, 3 Pack Bundles, Leakproof Kits, REC² Shorts, Essential Underwear, and all accessories. Learn more here.

Free standard shipping for orders over $50.
Within 30 days of delivery, you may return or exchange. The underwear item must be unworn, unwashed, and in its original condition with all tags and packaging intact.
Please see our Return & Exchanges policy here.

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ABSORBENT

MOISTURE-WICKING

WORRY-FREE BACKUP

SUSTAINABLE

Multi-Layer Performance.

Stay Fresh Longer - Instant absorption top layer for dry, all-day comfort.

Antimicrobial Protection - Zinc & Silver ion absorbent layer fights bacteria and odors.

Leak-Proof Confidence - Ultra-thin waterproof membrane prevents leaks.


*CORE:TX™ 5.0 shown.

Uniquely CORE:TX™.

Instant absorption top layer locks in moisture instantly preventing smears and dampness keeping you feeling fresh and dry throughout the day.

Ultra-soft wrapped edges give you comfort and mobility compared to sharp and hard glued edges that dig into your skin all day long.

360 Liquid Barrier.

Utilizing advanced water-proof stitching techniques and wrapped edges, the 360 Liquid Barrier provides double the leakproof performance while staying soft and comfortable.

RINSE. WASH. REPEAT.

Caring for your CORE:TX™ is simple. Quick rinse with cold water to remove any stains. Machine wash cold on a gentle cycle. Air dry to ensure longevity.

Reality Check.

Single-use products use over one million litres of water for production and generates over one million tons of waste each year. This waste can stay in landfills for up to 800 years.

Our commitment to the environment.

Caring for the environment is a responsibility we all share. Our biodegradable packaging ensures that once it’s done protecting your underwear, it returns to the earth without leaving a lasting footprint.

Bundles and Kits

Love your underwear and want more? Looking for different absorbencies to complete your set? Check out Bundles and Kits for tailored sets and discounts.

Visit Bundles and Kits

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4.7
Rated 4.7 out of 5 stars
Based on 288 reviews
Total 5 star reviews: 217 Total 4 star reviews: 61 Total 3 star reviews: 10 Total 2 star reviews: 0 Total 1 star reviews: 0
97%would recommend these products
Write a Review (Opens in a new window)
288 reviews
  • Liz
    Verified Buyer
    Yesterday
    Rated 5 out of 5 stars
    Absolutely fabulous: Fit, absorbency, and comfort

    I've got a lot of sensory issues and sensitivities and I've never been happy with my menstrual products. They made cycle time more stressful: cups were sometimes painful and I could feel the stem. Pads were bulky and uncomfortable (and wasteful), and don't even get me started on tampons.

    These period underwear are exactly what I was looking for, and I'm so glad you make them. I've done two cycles with them now.

    Here's a summary of what might be helpful to you:

    - Material is silky and comfy! (But not slidey like silk, they very much stay in place.) I have skin reactions to lots of stuff, and no problem with the material used for the sides/barriers.

    - I got the 3.0, and the gusset is just a bit thicker than my normal everyday pairs.

    - For my ND/sensation sensitive friends: My brain seems to react to anything different and uncomfy, to the point that I can't tolerate wearing many different items, and I barely notice these. (Everyone's brain is different, of course!)

    - Can wear them with leggings and the pantylines are barely there, or not there at all, depending on thickness and fit of legging.

    - Readily absorbs flow, no leaks here.

    - Easy to hand wash. (I just keep laundry detergent in the shower and wash them as instructed in there, convenient as that's usually when I'd take them off anyways.)

    - As they let you know on the page description, they are SNUG when you first purchase them. They were snug enough when they arrived I was quite afraid that I couldn't wear them,…

    Was this helpful?
    Athleticus Research
    7 minutes ago

    Hi Liz,

    Thank you so much for your thoughtful and heartfelt review! We're beyond happy to hear that our leakproof underwear has made such a positive difference for you, especially when you've had a tough experience with other menstrual products in the past. It means so much to us that you found the fit, absorbency, and material comfortable and supportive, particularly given your sensory sensitivities. We design with care and intention, so knowing that our product meets your needs truly makes our day.

    Your detailed feedback will be incredibly helpful for others navigating similar challenges, and we're grateful you took the time to share it. Thank you again for trusting us—we're so glad to have you in our community!

  • Shawn K.
    Verified Buyer
    1 week ago
    Rated 5 out of 5 stars
    I got these for my daughter

    She likes how thin and sleek these are. Very comfortable! So far so good!

    Was this helpful?
  • Alice F.
    Verified Buyer
    2 weeks ago
    Rated 5 out of 5 stars
    Love these!

    Really love these period underwear! They are super comfy and no panty lines are awesome too!

    Was this helpful?