UPF 50+ Swim Hats That Actually Stay On in the Water

Best Sellers

Who wears Nammu

Swimmers, snorkellers and anyone who needs sun protection that survives being in the water. Also people who have given up on it: alopecia, cochlear implants, hair loss after chemotherapy, and children who pull off every other hat within a minute.

Classic Nammu is our most popular style, featuring the signature triangle-shaped back. Available in a variety of colors and prints, it’s undoubtedly the favorite Nammu hat.

Classic Nammu with Visor is a twist on our classic style. It has the same signature triangle back and a flexible, soft brim for extra face shade.

EX UV Pro is our Nammu collection featuring hats with a square back for extra sun protection. The sleek design of these hats provides added coverage while maintaining style

Part of the EX UV Pro collection, our Nammu hat with a square back and soft, flexible visor is perfect for water activities

Part of the EX UV Pro collection, our Nammu hat with a square back and ear flaps offers extra sun protection for the ears. This hat is our most popular choice for snorkeling

Part of the EX UV Pro collection, our Nammu hat with a square back, visor, and ear flaps offers our most extensive sun protection coverage

Part of the EX UV Pro collection, the Nammu 360 All-Around Visor Hat offers complete sun protection with a wide brim that provides shade from every angle. Designed for ultimate versatility, it ensures your face, neck, and ears are shielded from harmful UV rays, whether you’re in the water or on land.

Why Choose Nammu?

• It stays on. A tie-back instead of a chin strap, so nothing to pull off and nothing to lift when you go under.
• Coverage that doesn’t wash off. Sunscreen needs reapplying and rinses off within minutes in the water. Fabric doesn’t.
• It survives a suitcase. Visor styles pack completely flat and spring back into shape. Straw and structured brims do not.
• Covers what sunscreen misses. Scalp, ears and the back of the neck, which is where snorkellers burn.
• Fits a whole family. Toddler from age two through adult, $15 to $25.
• Made for adaptive needs. Alopecia, cochlear implants and hair loss after chemotherapy.

Common questions

Do swim hats actually stay on when you swim?

Most sun protection fails at exactly this point. A brimmed sun hat lifts the moment your head goes under, and a standard swim cap leaves your ears and neck bare. A fitted hat with a tie-back stays put through dives, waves and lane swimming.

Does a swim hat replace sunscreen?
Not entirely, but it covers the places sunscreen struggles. Sunscreen needs reapplying every couple of hours and rinses off within minutes in the water. A hat that stays on covers your scalp, ears and the back of your neck for as long as you’re swimming.

What can I wear swimming if I have alopecia or no hair?

A soft fitted swim hat covers the scalp, ears and neck without the tightness of a silicone cap. Nammu hats are worn by people with alopecia, cochlear implants and hair loss after chemotherapy, and are listed by the National Alopecia Areata Foundation.

Will a sun hat survive being packed?

Nammu’s visor styles pack completely flat and return to shape when you unpack them, and hold that shape wet. Most wide-brim sun hats arrive bent.

What size do I need?

One size fits most heads from age two through adult, with an XL for head circumference over 21.5 inches. The tie-back adjusts the rest.