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Unboxing
Brief
Bikini
Shorty
Unboxing
Brief
Bikini
Shorty
Fresh Start Period Kit
A mix of our 3 styles (Brief, Bikini, Shorty) to last your entire cycle.
Each pair holds up to 3 teaspoons. Use as a replacement on lighter days, or as a backup on heavier days.
60-day Trial
Try THINX (BTWN) for 60 days and if it doesn’t help you period better we’ll give you your money back — no questions asked!
Fabric
Outer shell
95% organic cotton, 5% elastane
Inner lining
95% organic cotton, 5% elastane
Middle layers
95% cotton, 5% elastane, 80% polyester, 20% nylon, breathable PUL
Wash & Care
Between uses, rinse, throw in the washing machine (cold or warm water), and hang dry. No bleach, fabric softener, or irons.
What's My Size?
THINX (BTWN) are true to classic sizing for girls’ underwear and clothing.
IN
CM
9-10
11-12
13-14
15-16
Natural Waist
23¾-24½60-62
24¾-25¼63-64
26-26½65.5-67
28-29¼71-74
Lower Waist
27-2868.5-71
29¼-30½74-77
31¾-3380-83
34½-3687-91
Hip
29-30¼73.5-77
31½-3380-84
34½-3688-92
37½-3996-100
How Do THINX (BTWN) Work?
How Do THINX (BTWN) Work?
Made with period-proof technology to prevent leaks and stains, THINX (BTWN) can replace or back-up other period products.
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FAQs
( Q )
Will there be stains on my THINX (BTWN)?
( A )
Nope. The interior of the underwear is lined with black fabric, so you never look down and see stains.
( Q )
How many pairs of THINX (BTWN) do I need?
( A )
Some people buy a Fresh Start Period Kit so they have multiple pairs to last their entire cycle, others just buy one pair and wash it at night before wearing the next day — it’s up to you!
Got more Qs? We’ve got you covered.
More FAQS
Check Out Our Other Styles
