Essential Bikini

You can count on these seamless bottoms for top-notch comfort, and zero pantyline. Plus, the quick dry gusset and soft, breathable fabric will keep you cool and dry all day long

This underwear does not protect against leaks.

You can shop our Leakproof Underwear here

Please note: All underwear are final sale.

Underwear Essentials

Your new favorite pair combines technical fabrics, innovative design, and refreshing functionality.
Heat Bonded Seams
Ensures a seamless fit. Wear under tight pants or leggings with no underwear lines.
Conforms to Your Body
Super-adaptive 4-way stretch material will relax with wash and wear and mold to your body.
Cotton Gusset
Anti-odor and quick-dry technology is perfect for everyday use. If you're looking for more absorbency, check out Leakproof!
average rating 4.6 out of 5
Based on 1162 reviews
  • 5 Stars
    865 Reviews
  • 4 Stars
    171 Reviews
  • 3 Stars
    79 Reviews
  • 2 Stars
    21 Reviews
  • 1 Star
    26 Reviews
90% of reviewers would recommend this product to a friend
Rated 4 out of 5
Rated 4 out of 5
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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1162 Reviews
Reviewed by Laura B.
Verified Buyer
Rated 3 out of 5
Review posted

I want to love them

After reading the reviews for these underwear I thought they would be perfect for all my thin skirts that tend to show my underwear line. These undies fit well and are comfortable except them tend to ride up my butt. I wish there was a little more coverage on the cheeks. I still wear them but they are definitely not my go to choice like my knix wear bra is. I am fairly certain I bought the right size for me. The riding up my butt was a real deal breaker. I will not be buying them again.

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Reviewed by Erica
Verified Buyer
I recommend this product
Pant Size
Purchased Size
Rated 4 out of 5
Review posted

Comfortable undies, but super fragile – DO NOT DRY

I've purchased over a dozen pairs of Knix underwear since 2016, a combo of the essential bikinis and leakproof. They are comfortable and great for active people as they dry fast. Excellent for workouts, hikes, etc. They help neutralize when things get funky/sweaty, if you know what I mean. BUT...and this is a big but for me – I just had 5 pairs start to fall apart after being put in the dryer. I know, I know I should follow the care instructions that say lay flat to dry. But sometimes your boyfriend does the laundry and he doesn't remember to take out the lingerie bag and it ends up in the dryer, you know?!

It's a bummer to spend $18/pair on underwear that can't stand up to a medium heat run through the dryer. Every dried pair has the same issue of the crotch seam peeling apart from the gusset, and I have to assume it will keep peeling away over time. So – take my sad tale as a cautionary one. DO NOT DRY YOUR KNIX UNDERWEAR. It's crazy to me that others haven't had this issue. Maybe I'm just irresponsible with my laundry.

Rated 5 out of 5
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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