Up to 40% off 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.

15-40% off

Light Leakproof No-Show Thong

$12.00 USD

$20.00

40% off

+10

15-40% off

Light Leakproof No-Show High Rise Thong

$20.40 USD

$24.00

15% off

15-40% off

Light Leakproof Gossamer Lace Thong

$14.00 USD

$24.00

41% off

Gabi has 45" hips, 33" waist and wears a Knix size XL

40% off

Light Leakproof No-Show Mesh Thong

$12.00 USD

$20.00

40% off

Marlene has 50" hips and wears a Knix size XXL

40% off

Light Leakproof No-Show Cheeky

$13.00 USD

$22.00

40% off

Abigail has 43.5” hips and is wearing a Knix size L

15-40% off

Light Leakproof No-Show Bikini

$13.00 USD

$22.00

40% off

+20

Bras End of Year Sale Picks Feature Tile Image Mobile

Bras End of Year Sale Picks Feature Tile Image Desktop

15-40% off

Light Leakproof Gossamer Lace Bikini

$22.09 USD

$26.00

15% off

15-40% off

Light Leakproof Gossamer Lace French Cut

$16.00 USD

$28.00

42% off

Amber has 38" hips and wears a Knix size M

15-40% off

Light Leakproof No-Show Boyshort

$18.70 USD

$22.00

15% off

+18

Esther has 38” hips and is wearing a Knix size M

15-40% off

Light Leakproof No-Show High Rise

$15.00 USD

$26.00

42% off

+15

Abigail has 43.5" hips and wears a Knix size L

15% off

Leakproof Logo Rib Modal Boxer Brief

$32.30 USD

$38.00

15% off

Becca has 47" hips and wears a Knix size XL

15-40% off

Leakproof Thigh Saver® 6”

$23.00 USD

$39.00

41% off

Light Absorbency

Light periods, backup protection & sweat - absorbs about 1-3 regular tampons’ worth.

Adiya has 43" hips and wears a Knix size L

15-40% off

Light Leakproof UltraThin No-Show Thong

$19.54 USD

$23.00

15% off

40% off

Light Leakproof UltraThin Thong 3-Pack Gift Box

$37.00 USD

$62.00

40% off

15-40% off

Light Leakproof No-Show French Cut

$14.00 USD

$24.00

41% off

+18

15-40% off

Leakproof UltraThin No-Show French Cut

$16.00 USD

$27.00

40% off

+12

15% off

Leakproof Logo Rib Modal French Cut

$23.79 USD

$28.00

15% off

Claire has 35" hips, 24" waist and wears a Knix size S

15% off

Light Leakproof No-Show Mesh Bikini

$18.70 USD

$22.00

15% off

End of Year Sale Shop All Sale Feature Tile Mobile

End of Year Sale Shop All Sale Feature Tile Desktop

Maya has 45.5" hips, 34.5" waist and wears a Knix size XL

40% off

Light Leakproof No-Show Mesh Boyshort

$13.00 USD

$22.00

40% off

15% off

Light Leakproof No-Show Mesh High Rise

$22.09 USD

$26.00

15% off

Isabelle has 40" hips and wears a Knix size M

15% off

Leakproof Contour Thigh Saver® 6”

$39.09 USD

$46.00

15% off

Tsanna has 34.5" hips and wears a Knix size S

15% off

Leakproof Thigh Saver® 10”

$37.40 USD

$44.00

15% off

Medium Absorbency

Medium periods, light bladder leaks & sweat - absorbs about 2-3 super tampons’ worth.

15-40% off

Ultrathin French Cut 3-Pack

From $48.00 USD

40% off

15-40% off

Leakproof No-Show Thong

$16.00 USD

$27.00

40% off

+10

15-40% off

Leakproof UltraThin No-Show French Cut

$16.00 USD

$27.00

40% off

+12

40% off

Leakproof UltraThin High Rise 3-Pack Gift Box

$46.00 USD

$78.00

41% off

15-40% off

Leakproof UltraThin No-Show Bikini

$15.00 USD

$25.00

40% off

+10

Gabrielle has 48” hips and wears a Knix size XXL

15% off

Leakproof Cotton Bikini

$19.54 USD

$23.00

15% off

Sleep End of Year Sale Picks Feature Tile Mobile

Sleep End of Year Sale Picks Feature Tile Desktop

40% off

Leakproof UltraThin Bikini 3-Pack Gift Box

$40.00 USD

$67.00

40% off

Astrology Collection Leakproof UltraThin Bikini

$15.00 USD

$25.00

40% off

Leakproof Cotton Modal Bikini

$17.00 USD

$29.00

41% off

15-40% off

Leakproof UltraThin No-Show High Rise

$24.65 USD

$29.00

15% off

+10

15% off

Leakproof Cotton High Rise

$22.95 USD

$27.00

15% off

40% off

Leakproof Cotton Modal High Rise

$20.00 USD

$34.00

41% off

40% off

Leakproof Corelove High Rise

$22.00 USD

$38.00

42% off

15% off

Leakproof Cotton Boybrief

$29.75 USD

$35.00

15% off

40% off

Luxe Modal Leakproof Sleep Boxer

$22.00 USD

$38.00

42% off

Heavy Absorbency

Heavy periods, overnight protection & light bladder leaks - absorbs about 3-6 super tampons’ worth.

15-40% off

Dream Short 2-Pack

From $50.00 USD

40% off

15-40% off

Super Leakproof® No-Show Bikini

$24.65 USD

$29.00

15% off

15-40% off

Super Leakproof® No-Show Boyshort

$24.65 USD

$29.00

15% off

15-40% off

Super Leakproof® No-Show French Cut

$19.00 USD

$32.00

40% off

+12

15-40% off

Super Leakproof French Cut 3-Pack

From $57.00 USD

40% off

15-40% off

Super Leakproof® No-Show High Rise

$28.90 USD

$34.00

15% off

15-40% off

Super Leakproof® Dream Short

$35.69 USD

$42.00

15% off

Reusable Snap Leakproof Pads - Regular (3-Pack)

$30.59 USD

$36.00

15% off

Ultra Absorbency

Extra heavy periods, overnight protection & light bladder leaks - absorbs about 7-9 super tampons’ worth.

15% off

Ultra Zones+ High Rise 3-Pack

From $99.44 USD

15% off

Ultra Leakproof Zones+ Bikini

$30.59 USD

$36.00

15% off

Ultra Leakproof Zones+ High Rise

$33.15 USD

$39.00

15% off

Reusable Snap Leakproof Pads - Overnight (3-Pack)

$34.00 USD

$40.00

15% off

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.

15% off

Reusable Snap Leakproof Pads - Overnight (3-Pack)

$34.00 USD

$40.00

15% off

Reusable Snap Leakproof Pads - Regular (3-Pack)

$30.59 USD

$36.00

15% off

Up to 50% off Teen Period Underwear

Moisture-wicking, odor-crushing, life-changing leakproof undies.

15-40% off

Teen Super Leakproof® Sleepover Short

$23.00 USD

$39.00

41% off

30-40% off

Teen Leakproof UltraThin No-Show Bikini 3-Pack

$46.00 USD

$66.00

30% off

40% off

Teen Super Leakproof® No-Show Bikini 2-Pack

$50.00 USD

15-30% off

Teen First Period Kit - Bikini

From $126.00 USD

30% off

15-40% off

Teen Super Leakproof® No-Show Bikini

$17.00 USD

$25.00

32% off

30% off

Teen UltraThin Bikini: Holiday 3-Pack

$46.00 USD

$66.00

30% off

15% off

Teen Leakproof Cotton Bikini

$17.00 USD

$20.00

15% off

15-40% off

Teen Light Leakproof No-Show Boyshort 3-Pack

$39.00 USD

$57.00

31% off

15-30% off

Teen First Period Kit - Boyshort

From $126.00 USD

30% off

Rose (she/her) has 35" hips and is wearing a size M

15-40% off

Teen Light Leakproof No-Show Boyshort

$16.15 USD

$19.00

15% off

15-30% off

Teen Leakproof UltraThin No-Show Boyshort

$18.70 USD

$22.00

15% off

15-30% off

Teen Leakproof UltraThin No-Show Bikini

$18.70 USD

$22.00

15% off

30-40% off

Teen Leakproof UltraThin No-Show Boyshort 3-Pack

$46.00 USD

$66.00

30% off

Jazzmyn (she/her) has 34" hips and is wearing a size S

15-40% off

Teen Light Leakproof No-Show Bikini

$16.15 USD

$19.00

15% off

15-40% off

Teen Super Leakproof® No-Show Boyshort

$17.00 USD

$25.00

32% off

15-40% off

Teen Light Leakproof No-Show Bikini 3-Pack

$34.00 USD

$57.00

40% off

15-40% off

Teen Super Leakproof® No-Show Bikini 3-Pack

$63.75 USD

$75.00

15% off

15-40% off

Teen Super Leakproof® No-Show Boyshort 3-Pack

$45.00 USD

$75.00

40% off

Tracy (she/her) has 37" hips and is wearing a size M

40% off

Teen Light Leakproof No-Show Bikini 2-Pack

$22.00 USD

$38.00

42% off

40% off

Teen Light Leakproof No-Show Boyshort 2-Pack

$38.00 USD

40% off

Teen Super Leakproof® No-Show Boyshort 2-Pack

$30.00 USD

$50.00

40% off

Sydney has 36" hips and is wearing a size M

15% off

Teen Light Leakproof No-Show High Rise

$18.70 USD

$22.00

15% off

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.