Leakproof Full Coverage Bikini Bottom

Coverage and confidence! This fully-lined bikini bottom provides you with full coverage on the hip and bum, plus a built-in absorbent liner for confident period protection – about the same as 3 tampons.

Period Swimwear FAQs

The layers in the gusset of the underwear work to trap and absorb your period so it doesn't leak in the water (or on land!) Our Swimwear features the same Leakproof Technology as our Period Underwear with an additional thin layer of waterproof material for extra protection.

The inner layers absorb the blood and traps it, so there's no leakage when you swim. When it goes in the laundry with detergent, it releases through the top layer— leaving your swim fresh and clean for tomorrow's laps. Reminder: No bleach or softener, and lay flat to dry.

Our Leakproof Swimwear has a super discreet absorbent pad in the gusset liner that absorbs up to 3 tsps of blood, which equals about 3 tampons.

You don’t need to. Every period is different though, and we recommend doing whatever makes you feel most confident. Knix Period Swimwear can be worn alone without any additional period protection or used as backup protection on super heavy days with a tampon or menstrual cup.

The layers in the underwear work to trap and absorb blood while you swim. We want you to feel 100% confident in your Period Swimwear, so if it is a heavy flow day, we suggest wearing tampons or menstrual cups with your suit for worry-free swim protection.

After your swim, just machine-wash the swimwear on a cold cycle and lay flat to dry. Do not bleach.

Definitely. Our swimwear is seawater and chlorine resistant and has 50+ SPF protection!

average rating 4.3 out of 5
Based on 3 reviews
  • 5 Stars
    2 Reviews
  • 4 Stars
    0 Reviews
  • 3 Stars
    1 Review
  • 2 Stars
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100% of reviewers would recommend this product to a friend
Comfort
Rated 5 out of 5
Effectiveness
Rated 4 out of 5
Sizing
Rated 0 on a scale of minus 2 to 2, where minus 2 is Runs Small, 0 is True to Size and 2 is Runs Large
3 Reviews
Reviewed by KB
Verified Reviewer
I recommend this product
Pant Size
12
Size Purchased
L
Usage
Period Back-Up
Rated 5 out of 5
Review posted

Works so well

I was stuck in a scuba boat for 7 hours with no bathroom facilities. In and out of the water and wearing a wetsuit. On my heaviest day I pulled my wetsuit off expecting a red puddle but there was nothing.

How they work, I have no idea, but I will be using them from now on. I wish these had been around when I had been young.

They also fit so well they became my go to everyday bikini bottoms.

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Comfort
Rated 5 out of 5
Effectiveness
Rated 5 out of 5
Sizing
Rated 0 on a scale of minus 2 to 2, where minus 2 is Runs Small, 0 is True to Size and 2 is Runs Large
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Reviewed by Ana P.
Verified Buyer
I recommend this product
Pant Size
20
Size Purchased
XXL
Usage
Period Back-Up
Rated 5 out of 5
Review posted

Wow

These are so nice. Way better than I thought. They feel great and I got a pair for my teen daughter and myself. Definitely worth the money, if your debating on buying i highly recommend doing it, especially if its for your daughter. It's nice to be able to go swimming and not have that worry...

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Comfort
Rated 5 out of 5
Effectiveness
Rated 5 out of 5
Sizing
Rated 0 on a scale of minus 2 to 2, where minus 2 is Runs Small, 0 is True to Size and 2 is Runs Large
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Reviewed by Roxie
Verified Buyer
I recommend this product
Pant Size
14
Size Purchased
L
Usage
Period Back-Up
Rated 3 out of 5
Review posted

Wanted so, so bad to love these but they leaked.

I was really hoping these would work, and gave them a try at home before wearing them to the beach. Within an hour and a half I was leaking through the front. I hadn’t even submerged my trunk in the water (we have a 2-foot-deep kiddie pool set up), just my legs. I thought I was just sweaty, but when I looked down I was leaking through.

For me, the gusset wasn’t tall enough in the front- I think it came through the un-leakproof part. I have this problem with the dream shorts too, on heavy days. I need another inch or two in the front or else it seeps above the lining and comes through.

The fit was great, the coverage was great, the *idea* is great. The pattern is adorable! And I’m sure if I had had my cup in, they’re awesome as backup. But I really wanted to try them alone and see what would happen. I would 0/5 recommend them as primary coverage, unless you want to look down in an hour and have your three year old ask you if your “girl booty” has a bo-bo. Save these just for backup or spotting days.

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Comfort
Rated 5 out of 5
Effectiveness
Rated 2 out of 5
Sizing
Rated 0 on a scale of minus 2 to 2, where minus 2 is Runs Small, 0 is True to Size and 2 is Runs Large
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