New from Tranquility: A disposable swim product that won't swell up in water! Swimmates are the first disposable swim diaper available for bowel containment that won't swell up from the pool water. Swim mates are easy to use - simply use once, then tear the side seams to dispose in the trash. Wear under your swim suit for discreet form fitting protection. Latex-free. M: Fits 34" to 48" (120 to 175 lbs), 20 per package This is size medium. One underwear from the package has been used Please text for quickest reply, 236-562-6212, thanks