Frequently Asked Questions
Everything you need to know about our period-absorbing underwear and apparel.
How do I wash my Thinx underwear?
Machine wash cold on a gentle cycle with mild detergent. Do not use bleach or fabric softener. Hang dry only to preserve the integrity of the moisture-wicking technology.
How much liquid can Thinx hold?
Absorbency varies by style. Our Super styles hold up to 5 tampons' worth of flow, while our Light styles are designed for backup or lighter days, holding about 1 tampon's worth.
What is your return policy?
We offer a 60-day trial period. If you are not satisfied with your first pair, you can return or exchange it for free, even if it has been worn and washed.
Do you ship internationally?
Yes, we ship to most countries worldwide. Shipping costs and delivery times vary by location and will be calculated at checkout.
Are Thinx products safe and PFAS-free?
Yes, our products are rigorously tested for safety. We do not use PFAS or other harmful chemicals in our manufacturing process to ensure our apparel is safe for your body.
How do I find the right size?
We recommend checking our comprehensive Size Guide, which includes hip and waist measurements. If you are between sizes, we generally suggest sizing up for the most comfortable fit.