| Black

BOOST Boxer

Black / XXS
$19.25 USD $55.00 USD
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Leakproof Undies
| Black
BOOST Boxer

Leakproof Undies

BOOST Boxer
$19.25 USD $55.00 USD 65% off

Extra 20% off with code: BIGFUN20
Absorbency
Pack Size
ColorBlack
Size Size guide

Our boxers run large, please refer to our size guide to determine your perfect fit.

Boxer Size Guide

Our boxers are a mid rise fit, we recommend basing your size off of your hip measurement. Standing with your feet together, wrap a soft measuring tape around the widest part of your hip parallel to the floor.

Not measuring? Size down from your usual size, our Boxer styles run large.

Size Hip Waist
XXS 32-35" 23-25"
XS 35-37" 25-27"
S 37-39" 27-30"
M 39-41" 30-32"
L 41-43" 32-34"
XL 43-45" 34-38"
1X 45-49" 38-42"
2X 49-54" 42-47"
3X 54-59" 47-51"
4X 59-64" 51-56"
5X 64-69" 56-59"

Shipping & Returns

Shipping

US & Canada

Order value Cost Delivery
Over $99 $2.99 5–7 business days
Under $99 $9.99 7–10 business days
Any order (VIP) $21.99 3–5 business days

International

Order value Cost Delivery
Over $200 $50 7–14 business days
$90–$199.99 $25 7–14 business days
Under $90 $15 7–14 business days

View full policy →

Returns

We accept returns of unopened, unworn, non-sale underwear within 20 days of delivery for store credit. Due to the intimate nature of our products, we are unable to offer refunds.

At this time, we are unable to accommodate exchanges.

All products purchased on sale are final sale and not eligible for return.

View full policy →
Pay with HSA/FSA at checkout

Details

Fit & Feel
  • Absorbency: 4-8 regular tampons
  • Adjust absorbency with BOOSTER
  • Machine washable
  • Includes one BOOSTER
  • Best for: Easy refresh · Value for money · Light to heavy flows · Overnight
  • Fit + coverage: Mid rise · 2.75" inseam · Runs large, size down
Materials
BODY
48% TENCEL™ lyocell, 48% organic cotton, 4% spandex
LINING
86% OEKO-TEX certified, PFAS-Free*, recycled polyester, 14% organic cotton
LEAKPROOF CORE
64% OEKO-TEX certified, PFAS-Free*, recycled polyester, 15% polyester, 11% organic cotton, 10% TPU
BOOSTER
​65% OEKO-TEX certified, PFAS-Free*, recycled polyester, 24% polyester, 11% hemp
Care instructions
Machine wash cold · No fabric softener or bleach · Dry on low heat
Diagrams
Diagram 1 Diagram 2

Savings per wear: $4based on 8 tampons

Prebiotic Undies New

Everyday SoftFit with ProBioma™ for the rest of your cycle. Not leakproof.

View Collection →

OEKO-TEX® certified

PFAS-Safe*

B-Corp certified

BOOST Adjustable Absorbency

Protection you can customize

Absorbs 4-8 tampons

Not every day requires the same level of protection. That’s why we developed BOOST, our adjustable absorbency system.

BOOST allows you to customize protection using a removable absorbent BOOSTER, adding capacity only when you need it. 

What is a BOOSTER

A BOOSTER is a removable insert shaped like a pad without wings that is designed to fit into our BOOST underwear.

How it works

BOOST can be worn with or without a BOOSTER for light or heavy coverage.

Adjust absorbency by sliding the removable BOOSTER into the front and back openings of the gusset.

How it performs

BOOST features our integrated three layer leakproof system to wick fluid away from the body and absorb up to 4 tampons worth of fluid.
Woman sitting on a windowsill holding a mug, wearing a light blue sweatshirt and Aisle period underwear in Espresso.

Why we made it

Adjustable absorbency means better comfort, better performance, and you need fewer products overall.

Made with you in mind

OEKO-TEX® certified

Our fabrics are certified free from harmful substances, gentler on skin, safer for long-term wear, ultimately, reducing irritation.

Stitched, not glued

Stitched seams hold up through 100+ washes. Bonded (glued) construction stretches out and breaks down over time.

PFAS-Safe*

No PFAS or unnecessary chemical treatments in our leakproof layers, materials designed to be safe against your skin.

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