Period Underwear
Now with more styles and absorbencies. All of the protection, none of the bulk.
Lightest Absorbency
Lightest periods, spotting, sweat & discharge - absorbs about 0.5-1 regular tampon worth.
Light Leakproof No-Show Thong
Save up to 20%
Color: Cherry, limited edition
Light Leakproof No-Show Mesh Thong
Save up to 20%
Color: Orchid, limited edition
Light Leakproof Gossamer Lace Thong
Save up to 20%
Color: Dark Cherry, limited edition
Light Leakproof No-Show Bikini
Save up to 20%
Color: Honey, limited edition
Light Leakproof Gossamer Lace Bikini
Save up to 20%
Color: Olive, limited edition
Light Leakproof Gossamer Lace French Cut
Save up to 20%
Color: Dark Cherry, limited edition
Light Leakproof No-Show Boyshort
Save up to 20%
Color: Glacier, limited edition
Light Leakproof No-Show High Rise
Save up to 20%
Color: Rose Water
Light Absorbency
Light periods, backup protection & sweat - absorbs about 1-3 regular tampons’ worth.
Light Leakproof UltraThin No-Show Thong
Save up to 20%
Color: Midnight
Light Leakproof UltraThin Thong 3-Pack Gift Box
Save 10%
Color: Shine Bright/Cherry/Olive, limited edition
Light Leakproof No-Show French Cut
Save up to 20%
Color: Dark Blooms, limited edition
Leakproof Contour Thigh Saver® 6”
Save up to 20%
Color: Warm Sand
Leakproof UltraThin No-Show French Cut
Save up to 20%
Color: Mushroom, limited edition
Medium Absorbency
Medium periods, light bladder leaks & sweat - absorbs about 2-3 super tampons’ worth.
Leakproof No-Show Thong
Save up to 20%
Color: Dark Cherry, limited edition
Leakproof UltraThin No-Show French Cut
Save up to 20%
Color: Warm Sand
Leakproof UltraThin High Rise 3-Pack Gift Box
Save 10%
Color: Shine Bright/Cherry/Olive, limited edition
Leakproof UltraThin No-Show Bikini
Save up to 20%
Color: Cherry, limited edition
Astrology Collection Leakproof UltraThin Bikini
Save up to 20%
Color: Virgo, limited edition
Leakproof Cotton Bikini
Save up to 20%
Color: Black
Leakproof UltraThin Bikini 3-Pack Gift Box
Save 10%
Color: Shine Bright/Cherry/Olive, limited edition
Leakproof UltraThin No-Show High Rise
Save up to 20%
Color: Warm Sand
Leakproof Cotton High Rise
Save up to 20%
Color: Mushroom, limited edition
Luxe Modal Leakproof Sleep Boxer
Save up to 20%
Color: Dark Cherry, limited edition
Heavy Absorbency
Heavy periods, overnight protection & light bladder leaks - absorbs about 3-6 super tampons’ worth.
Super Leakproof® No-Show Bikini
Save up to 20%
Color: Dark Blooms, limited edition
Super Leakproof® No-Show French Cut
Save up to 20%
Color: Dark Cherry, limited edition
Super Leakproof® No-Show High Rise
Save up to 20%
Color: Dark Blooms, limited edition
Super Leakproof® Dream Short
Save up to 20%
Color: Glacier, limited edition
Ultra Absorbency
Extra heavy periods, overnight protection & light bladder leaks - absorbs about 7-9 super tampons’ worth.
Ultra Leakproof Zones+ High Rise
Save up to 20%
Color: Dark Teal, limited edition
Reusable Pads
NEW Reusable Pads! Leak-free protection designed with a comfortable barely-there feel. Super-thin, and easy-to-wash Leakproof pad that you can wear and rewear. Now available in super-absorbent Regular and Overnight styles for confident protection 24/7.
Teen Period Underwear
Moisture-wicking, odor-crushing, life-changing leakproof undies.
Teen Super Leakproof® Sleepover Short
Save up to 20%
Color: Posy, limited edition
Teen Light Leakproof No-Show Boyshort
Save up to 20%
Color: Night Sky, limited edition
Teen UltraThin Bikini: Holiday 3-Pack
Color: Comet/Atmosphere/Starstruck, limited edition
Teen Leakproof UltraThin No-Show Bikini
Save up to 20%
Color: Galaxy, limited edition
Teen Leakproof UltraThin No-Show Boyshort
Save up to 20%
Color: Perfect Pear, limited edition
Teen Leakproof UltraThin No-Show Boyshort 3-Pack
Save 10%
Color: Ruby/Sugar Plum/Posy, limited edition
Teen Super Leakproof® No-Show Bikini
Save up to 20%
Color: Perfect Pear, limited edition
Teen Super Leakproof® No-Show Boyshort
Save up to 20%
Color: Galaxy, limited edition
Teen Leakproof Luxe Modal Sleep Boxer
Save up to 20%
Color: Ruby, limited edition
Teen Light Leakproof No-Show Boyshort 3-Pack
Save 10%
Color: Ruby/Sugar Plum/Posy, limited edition
Teen Light Leakproof No-Show Bikini 3-Pack
Save 10%
Color: Blueberry/Holly/Galaxy, limited edition
Stock Up & Save
Get all the period protection you need with Knix leakproof underwear kits. Find your perfect assortment of absorbent, comfortable, and machine-washable underwear, and enjoy worry-free protection no matter how heavy your flow.
Reusable period underwear that truly works - absorbent, leak resistant, comfy and easy to wash. Find your perfect style today!
Your leakproof questions, answered.
