All Day Everyday Comfort Bikini Period Underwear

front image of thinx everyday comfort bikini in black

side view of thinx everyday comfort bikini in black

back view of thinx everyday comfort bikini in black

leakproof gusset information on absorbency

Leakproof all day up to 12 hours

Part of our Thinx for All line of comfy cotton period underwear in streamlined styles and colors.

Designed without PFAS and any other harsh substance on our Clean Commitment List

Composition/Ingredients:
Main Body: 95% Cotton 5% Elastane;
Gusset Fabric: Top layer: 100% Polyester; Second layer: 100% Polyester; Third layer: 100% Polyester with Thermoplastic Polyurethane coating.
Gusset colorant(s) and treatment(s) may include 1% or less of: Mekricon Red SPW BS, Goldenlon Black PHT, Mekicron SF-R bs, Mekicron Black WT bs, Mekicron Yellow 6GSL bs, Terasil Black W-PES, Terasil Red W-4BS-01 150%, Terasil Yellow W-6GS, Disperse Black ECO, Goldenlon Navy Blue K-XNF, Goldenlon Red 2G-FL, Lava XL-N (Alumina, Silica, water, CI 77947), Suntex TN-5000 (Polyethylene Glycol Copolymer, Isotrideceth-9, Polyethylene Oxide).

Our underwear is certified according to OEKO-TEX® STANDARD 100:registered: [20.HUS.04850 | HOHENSTEIN HTTI]

Size chart

front image of thinx everyday bikini in black

Everyday Comfort Bikini

Waistband sits below the natural waist
Full coverage with a fitted leg
Fits true to size

Standard adult sizes:

incm

	XS	S	M	L	XL
US jean size	0-2	4-6	8-10	12-14	16-18
waist	23-25	26-28	29-31	32-34	35-37
hip	33-35	36-38	39-41	42-44	45-47

Adult plus sizes:

incm

	X	1X	2X	3X	4X
US jean size	14W	16-18W	20-22W	24-26W	28-30W
waist	36-37	38-40	42-44	46-48	50-52
hip	43-44	45-47	49-51	53-55	57-59

For most of our styles, the hip measurement is the most important to consider for selecting the best fit, especially if you're between sizes.

waist - Measure the smallest area of the torso - right above the belly button and below the ribcage.

hip - Measure the widest part of the hip

Our plus sizes are made with updated measurements through the waist, hip, and leg for your comfort. If you’ve purchased XXL-XXXL in the past, check your measurements against our new size chart — your size may have changed.

photo of thinx for all leaks hiphugger in black

HSA/FSA eligible
HSA/FSA eligible
HSA/FSA eligible

HSA/FSA eligible
HSA/FSA eligible
HSA/FSA eligible

HSA/FSA eligible
HSA/FSA eligible
HSA/FSA eligible

HSA/FSA eligible
HSA/FSA eligible
HSA/FSA eligible

HSA/FSA eligible
HSA/FSA eligible
HSA/FSA eligible

how our leakproof tech works

illustration of a shield with a droplet in the middle

LeakSafe™

Our LeakSafe™ barrier helps guard against leaks

dry feel

Moisture-wicking fabric helps keep you dry

odor controlling

Odor control technology helps minimize odors

illustration of a droplet on top of three fabric squares

absorbent

Absorbent layers hold up to 12 regular tampons worth

still have questions?

We have answers.

get more answers

How does period underwear work?

Our underwear for periods absorbs your flow, helps control odor, wicks moisture, and helps prevent leaks — so teens feel fresh, dry, and comfortable throughout the day! No other period products are required. Our period-absorbing underwear is machine washable and reusable— so you can wear, wash, and wear again!

How long will period-absorbing underwear help prevent leaks?

Our newest period underwear styles feature our all-day absorbency for up to 12 hours of period protection. No pads, tampons, or other period products are needed.

How do I find the right size?

We recommend following the hip measurement to find the most accurate size. Be sure to measure your hips at their widest point, derrière included! We recommend sizing up in underwear styles that fit below the natural waist, or if you're looking for the best fit postpartum. The underwear should fit snugly but not so tight that it becomes uncomfortable.

What's your return policy?

We offer a 45-day trial on all orders, so if you’re unhappy with your purchase, we’ll make it right. Final sale items, Thinx “merch”, and gift cards are nonrefundable. Visit our online Returns Portal to begin a return or exchange.

get more answers