Join Our Rewards Program
Earn rewards and exclusive member-only benefits for free.
Leakproof UltraThin No-Show Boybrief
Leakproof UltraThin No-Show Boybrief
$34.00
USD
Mix, Match & Save: 3+ for $25 each
Absorbs about 2.5 super tampons
Invisible under clothes
Moderate protection without the bulk
Machine washable
Size and Fit Guide
How to Measure
In order to select the correct sizing, we recommend you take the following measurements using a soft tape measure. If necessary, ask someone else to help.
Waist
Measure around the narrowest part of your torso, usually just above your belly button. Keep the tape snug and level, but not tight. The number where it meets is your waist measurement.
Hip
Stand with your feet together and measure around the fullest part of your hips and buttocks. Keep the tape level and snug, but not tight. The number where it meets is your hip measurement.
Build Your 3-Pack
Leakproof UltraThin No-Show Boybrief
Leakproof UltraThin No-Show Boybrief
Leakproof UltraThin No-Show Boybrief
Rewards Members Earn
34 Points
You May Also Like
Product Description
Comfort-First Fit
Worry-Free Protection
Our newest leakproof innovation provides more absorbency without the bulk. Patented 360 LeakSeal™ technology locks in leaks at every edge.
Moderate Absorbency
Absorbs 2.5 super tampons worth of liquid—perfect for moderate flow days, light bladder leaks, and sweat. The carbon cotton gusset top layer keeps you dry.
No-Show Style
Made from our signature buttery soft fabric with a wide, comfortable waistband. Wear it on its own or under your favorite pajamas.
Easy to Wash
Machine washable just like regular underwear.
Zoom
How to Choose?
Essential
- • Days you don’t need leak protection. Everyday freshness and moisture wicking.
-
0 tsp
Heavy
- • Extra peace of mind. For the first days of your cycle, light bladder leaks, or a full night's sleep without a leak.
-
about 8-14 tsp
-
about 1.5-3 regular pads
-
about 4-7 super tampons
-
about 1.5-3 menstrual cups
Light
- • Daily freshness. For sweat, discharge, period spotting, or backup protection.
-
about 1-3 tsp
-
about 1-3 pantyliners
-
about 1-3 regular tampons
-
about 0.5 menstrual cups
Moderate
- • For mid-cycle flow, surprise cough or sneeze leaks, or a really sweaty spin class.
-
about 4-8 tsp
-
about 1-1.5 regular pads
-
about 2-4 super tampons
-
about 0.5-3 menstrual cups
Ultra
- • Ultimate peace of mind. For the heaviest period days, light bladder leaks, unexpected postpartum flow, or overnight protection.
-
about 15-20 tsp
-
about 1.5-2.5 super pads
-
about 7-11 super tampons
-
about 2-3 menstrual cups
Our Best-Selling Underwear
Shop All
Selling Fast
Super Leakproof® Dream Boxer
$48.00
USD
2 for $80, Save $16
Color: Pink Stripe Limited Edition
Leakproof UltraThin No-Show High Rise
$32.00
USD
Mix, Match & Save: 3+ for $25 each
Color: Black with White Polka Dot Limited Edition
+5
Best Seller
Leakproof UltraThin No-Show Bikini
$27.00
USD
Mix, Match & Save: 3+ for $25 each
Color: Black with White Polka Dot Limited Edition
+4
Leakproof UltraThin No-Show French Cut
$27.00
USD
Mix, Match & Save: 3+ for $25 each
Color: Black with White Polka Dot Limited Edition
+1
Best Seller
SuperPlus Leakproof® No-Show High Rise
$39.00
USD
Mix, Match & Save: 3+ for $33 each
Color: Dark Cherry Limited Edition
FRESH FIX TECHNOLOGY®
Built-in protection that feels like nothing at all.
Our patented 360 LeakSeal™ technology locks in leaks at every edge. The ultra-thin liner absorbs about 2.5 super tampons worth of liquid.
Soft Top Layer
Middle Layer
Leakproof Layer
Recently Viewed
How to wash
Knix underwear is 100% reusable and machine washable, just like your regular undies.
Not required. But for best results, you can rinse your leakproof with cold water in the tub or sink before washing.
Machine wash on a cold, gentle cycle with mild detergent.
For their longest life, air drying is best. Hang or lay flat to dry.
Fabric softeners, bleach, ironing, or heat from the dryer.
