The Nammu swimming hat is designed to be a ONE-SIZE FITS ALL swim cap.

It’s made of flexible fabric, and you can adjust it to fit any head size by tying the straps in the back, which also adds extra strength.

We also offer two additional sizes:

– SMALL: This size is only available for reversible hats. It’s the same size as the regular hat, but because it has two layers of fabric, it fits a bit smaller.

– XL: This size is best for adults with above-average head sizes or anyone who prefers a looser fit.

– XS: This size is ideal for babies and toddlers and provides a snug fit.

Please note that the abbreviation “OS” stands for “One Size,” which is the regular size for most of our hats.

Important: The XS size will not work with Cochlear Implants, even for toddlers or babies.