‘Oh-No' Proof Boyshort

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$ US
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Buy 2, Save 15% per pair

Buy 5, Save 20% per pair

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‘Oh-No' Proof Boyshort
  • average rating 4.4 out of 5
    Based on 97 reviews
    • 5 Stars
      65 Reviews
    • 4 Stars
      14 Reviews
    • 3 Stars
      10 Reviews
    • 2 Stars
      3 Reviews
    • 1 Star
      5 Reviews
    81% of reviewers would recommend these products to a friend
    97 Reviews
    Review posted
    Rated 5 out of 5


    I bought 8 pair of these for my 12 year old daughter. They are amazing. She loves them and feels confident all day long. I read the reviews and agree that they do run small. Order a size up. She wear a size 6 in jeans, and I ordered Large boy shorts. They are perfect!

    Rated 5 out of 5
    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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    Review posted
    Rated 5 out of 5

    If you are a Ladies XS/S, this will fit you in the size large

    Bought these in the Large (I wear XS/S womens) and they fit! A cheaper option than the knixwear stuff that I highly recommend ladies! I was lucky that I live in Toronto, so no shipping or duties fees for me. Can't say the same about other countries though

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    Review posted
    Rated 3 out of 5

    Sizing guide could be more helpful

    I am 87 lb 4'9" adult. My hip measurement is 24 / 25 so I ordered 2 of the boybriefs in small. The fit is very tight on thighs and butt so that my circulation feels cut off making them impractical for exercise. They are thin and otherwise look amazing. Haven't had the chance to bleed in them. Was excited that there is Knixteen since regular Knix sizing is too large for me but I wish the sizing chart accounted for more body types such as curvy and athletic. I've already spent $30+ and have nothing I can use.

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    Review posted
    Rated 5 out of 5

    Game changer!

    I have bought the knixteen for myself and they have been a game changer in how I experience my periods! Now I feel smooth, dry, scent free and worry free that I might be leaking everywhere! The material is also so light and comfortable! I'm in love!

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    Review posted
    Rated 5 out of 5

    Great For Those with Light Periods

    These are not just for teens! I'm a full grown woman but with my birth control my period is only a few days of spotting. I love these undies. The ones Knixwear offers are great for workouts but not all day as they do not absorb as much as these. As for the size, I would say they maybe run a little small....in normal underwear I would normally wear a xs/s but I got a medium in the boy shorts here.

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  • 'Oh No' Proof Boyshort Period Underwear

    Boy oh boy, do we have the period undies of your dreams. These super comfy boyshorts give you protection from menstrual leaks, odor, moisture, and underwear lines in a cute and active cut. These are no period panties of yesteryear — this fresh cut is perfect for girls looking to both look and feel good during Auntie Flo’s monthly visit.

    These miracle panties can absorb up to 3 teaspoons of blood (that’s the equivalent of 2 regular tampons!). They’re totally seamless (can we get a hallelujah for no VPL in your cute summer dress?) And they’ll be there for you no matter what — these full coverage undies have your back covered. 

    We especially love how they keep you feeling fresh and odor-free throughout your period. Period panties are great for girls with more sensitive skin, and they don’t itch, rub, or cut into your skin. The fabric helps wick away moisture and sweat, keeping you bacteria-free and helping your skin breath. They’re also easy to clean — bye bye stains and hello comfort. Protect your pants and they’ll protect you back.

    Lightweight, fashionable, and 100% comfortable. Buy your pair today, or surprise a teen with a gift they’ll love.

    Why they’re awesome:

    • Made with super soft LYCRA SPORT® fabric and carbon cotton (translation: you stay dry when it matters the most).
    • Our seamless design lets you say goodbye to underwear lines — even under tight clothes, and when you’re out exercising.
    • ‘Oh-No’ Proof Technology™ (includes a super thin built-in panty liner that sucks up 1-3 tsp of moisture).
    • Moisture lock sides keep menstrual leaks in.
    • No-stink technology fights any unpleasant odor.
    • Perfect for wearing to school, gym class, sleepovers, horseback riding – anywhere!



    Body: 77% nylon, 23% LYCRA®

    Gusset Liner: 86% cotton, 10% spandex, 4% carbon

    Gusset: ‘Oh-No’ Proof Technology ™

    Care Instructions:

    Machine wash cold with mild detergent, do not bleach, lay flat to dry.

    *Flat rate shipping to US and Canada. Ships to select countries worldwide.

    *For hygiene reasons all underwear are final sale.