No leaks, no mess, no worries. First Line is here to keep you dry and on the go (or on the couch). With built-in leak protection for light days and incontinence, you’ll be able to rest, move, and breathe easy. And hey — they’re antibacterial and odor-repellent, all while looking and feeling just like your favorite Tomboys. Plus, the outside fabric is also leak resistant for even more protection. First Line underwear is made with OEKO-TEX® 100 Certified fabrics which are free from chemicals that are toxic to humans including PFOS and PFOA chemicals that have been shown to cause infertility or cancer. Learn more.

Fit-tested on all body types, sizes 3XS-6X

Looks and fits just like regular TomboyX Underwear
95% OEKO-TEX®-certified cotton, 5% spandex
Holds 8 tsps of liquid
Signature stay-put rainbow waistband

Odor-resistant
Smooth, durable flatlock seams won’t irritate or chafe
Machine wash cold in a mesh bag, line dries overnight. Avoid machine drying.

Be fiercely and unapologetically you. Browse our collections of bras, underwear & loungewear made for all genders, bodies & styles.

TomboyX

First Line Leakproof Bikini - Night Sky Rainbow

Size

Color

Megasku

Bikinis

The time-tested all-arounder for bed, couch, exercise, and low-key days. Lightweight, all-cotton French terry adds luxurious softness to every minute of wear, while breathable, moisture-wicking performance delivers all-season versatility. Contrast striped ribbing at the waistband and cuffs seals in the coziness.

Relaxed fit
100% OEKO-TEX
® certified cotton
Machine wash cold, tumble dry low
Two pork chop patch pockets
Contrast ribbed waistband and cuffs
Inseam: XS-2X: 31", 3X: 31.25", 4X: 31.5"

French Terry Jogger Lc - Black With Rainbow Rib

Sweatpants

Cozy French terry in a cooler cut for warmer days. Our sporty pull-on shorts with elastic at the waist are perfect for running laps, running errands, or lounging on the beach. Plus, we’ve added side seam pockets and a dolphin hem detail for wear-anywhere function and flyness. Being cozy is a year-round endeavor, and our lounge shorts are here to help. Carry what you need in our subtle side seam pockets, and feel secure knowing our soft waistband won't pull down or ride up. With all the softness of our terry, and fit-tested to make everyone feel their best, you'll probably want to snag two.

Stay put interior elastic ribbed waist band
100% OEKO-TEX® certified cotton

Side seam pockets
Dolphin hem detail

Inseam: sizes XS-2X: 3.5", 3X: 3.75", 4X: 4"

French Terry Track Shorts Lc - Black With Striped Rib

No leaks, no mess, no worries. First Line is here to keep you dry and on the go (or on the couch). With built-in leak protection for light days and incontinence, you’ll be able to rest, move, and breathe easy. And hey — they’re antibacterial and odor-repellent, all while looking and feeling just like your favorite Tomboys. Plus, the outside fabric is also leak resistant for even more protection. First Line underwear is made with OEKO-TEX® 100 Certified fabrics which are free from chemicals that are toxic to humans including PFOS and PFOA chemicals that have been shown to cause infertility or cancer. Learn more.

Fit-tested on all body types, sizes 3XS-6X

Looks and fits just like regular TomboyX Underwear
Body: 95% OEKO-TEX Certified cotton, 5% spandex Liner: 90% polyester, 10% spandex
Holds 8 tsps of liquid
Signature stay-put Rainbow waistband

Odor-resistant
Smooth, durable flatlock seams won’t irritate or chafe
Machine wash cold in a mesh bag, line dries overnight. Avoid machine drying.

Alana is 5’11” and wearing a size 2X Lisa is 5’5” and wearing a size Medium

First Line Leakproof Bikini - Plum Rainbow

No leaks, no mess, no worries. First Line is here to keep you dry and on the go (or on the couch). With built-in leak protection for light days and incontinence, you’ll be able to rest, move, and breathe easy. And hey — they’re antibacterial and odor-repellent, all while looking and feeling just like your favorite Tomboys. Plus, the outside fabric is also leak resistant for even more protection. First Line underwear is made with OEKO-TEX® 100 Certified fabrics which are free from chemicals that are toxic to humans including PFOS and PFOA chemicals that have been shown to cause infertility or cancer. Learn more.

Fit-tested on all body types, sizes 3XS-6X

Looks and fits just like regular TomboyX Underwear
Body: 95% OEKO-TEX Certified cotton, 5% spandex Liner: 90% polyester, 10% spandex
Holds 8 tsps of liquid
Signature stay-put X= black waistband

Odor-resistant
Smooth, durable flatlock seams won’t irritate or chafe
Machine wash cold in a mesh bag, line dries overnight. Avoid machine drying.

Alana is 5’11” and wearing a size 2X Mariama is 5’7” and wearing a size Medium

First Line Leakproof Bikini - Black X=

French Terry Jogger Lc - Heather Gray With Striped Rib

French Terry Jogger Lc - Black With Striped Rib

No leaks, no mess, no worries. First Line is here to keep you dry and on the go (or on the couch).
With built-in leak protection for light days and incontinence, you’ll be able to rest, move, and breathe easy. And hey — they’re antibacterial and odor-repellent, all while looking and feeling just like your favorite Tomboys. Plus, the outside fabric is also leak resistant for even more protection.
First Line underwear is made with OEKO-TEX® 100 Certified fabrics which are free from chemicals that are toxic to humans including PFOS and PFOA chemicals that have been shown to cause infertility or cancer. Learn more.

Fit-tested on all body types, sizes 3XS-6X

Looks and fits just like regular TomboyX Underwear
Body: 95% OEKO-TEX Certified cotton, 5% spandex Liner: 90% polyester, 10% spandex
Holds 8 tsps of liquid
Signature stay-put rainbow waistband

Odor-resistant
Smooth, durable flatlock seams won’t irritate or chafe
Machine wash cold in a mesh bag, line dries overnight. Avoid machine drying.

Alana is 5’11” and wearing a size 2X Lisa is 5’5” and wearing a size Medium

First Line Leakproof Bikini - Black Rainbow

Elegant, soft, and totally classic. Made from the soft, sustainable TENCEL™ Modal, our bikini cut gives you full coverage, a soft stay-put waistband, and the feeling of wearing nothing at all with the security of wearing the best.

Fit-tested on all body types, sizes XS-4X
Signature stay-put silky soft X= Black waistband
Sustainably sourced from renewable beechwood trees
Low rise
95% TENCEL™ Modal, 5% spandex
Highly stretchy to accommodate different body types
Smooth, durable flatlock seams won’t irritate or chafe
Machine wash cold, tumble dry low

Bikini - Tencel™ Modal Black

Elegant, soft, and totally classic. Made from the soft, sustainable TENCEL™ Modal, our bikini cut gives you full coverage, a soft stay-put waistband, and the feeling of wearing nothing at all with the security of wearing the best.

Fit-tested on all body types, sizes XS-4X
Signature stay-put silky soft Rainbow TomboyX waistband
Sustainably sourced from renewable beechwood trees
Low rise
95% TENCEL™ Modal, 5% spandex
Highly stretchy to accommodate different body types
Smooth, durable flatlock seams won't irritate or chafe
Machine wash cold, tumble dry low

Bikini - Tencel™ Modal Black Rainbow

The time-tested all-arounder for bed, couch, exercise, and low-key days. Lightweight, all-cotton French terry adds luxurious softness to every minute of wear, while breathable, moisture-wicking performance delivers all-season versatility. Ribbing at the waistband and cuffs seals in the coziness.

Relaxed fit
100% OEKO-TEX®-certified cotton
Machine wash cold, tumble dry low
Two pork chop patch pockets
Ribbed waistband and cuffs
Silicone-dipped drawcord