UPF 50+ · STAYS ON THROUGH DIVES & WAVES

The sun hat that swims

Covers your scalp, ears and the back of the neck – and it stays on.

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Nammu Classic Solid Colors

BESTSELLER

Nammu Classic Solid Colors

★★★★★ (122)

Nammu Extra UV Pro Square

BEST FOR SNORKELING

Nammu Extra UV Pro Square

★★★★★ (20)
Nammu EX UV Protection 360

Nammu EX UV Protection 360

★★★★★ (11)

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.

Kate McManus
Kate McManus
Verified ownerVerified owner
5/5

I looked everywhere for a good hat for using in the pool and found it! Very well made, stylish and comfortable.

2 weeks ago
nammu sun protection swim hats 360 - all around visor protection
Nammu EX UV Protection 360
Mark Moore
Mark Moore
Verified ownerVerified owner
5/5

Wore the hat for the first time out fishing the Jetties in South Carolina! Great hat! Stays on when the boat is up on plain! This is my 2nd Nammu hat.

2 weeks ago
nammu sun protection swimming hats ear flap and visor
Nammu Extra UV Pro ear flap and visor
Art K.
Art K.
Verified ownerVerified owner
5/5

Great hat (though haven't yet used it).

2 weeks ago
nammu sun protection swim hats classic solid colors
Nammu Classic Solid Colors
Melissa Hickson
Melissa Hickson
Verified ownerVerified owner
5/5

I use these for golf. They keep my head cooler than baseball caps. Also after golfing, my hair is less messy!

1 month ago
nammu sun protection swim hats classic solid with visor
Nammu Classic Visor
Melissa Hickson
Melissa Hickson
Verified ownerVerified owner
5/5

I use it for swimming and it is so comfortable!

1 month ago
nammu sun protection swim hats classic solid colors
Nammu Classic Solid Colors

Which Nammu is right for you?

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.

Frequently asked questions

What is the best swim hat that stays on in the water?

A swim hat designed for the water, not a regular sun hat. Nammu swim hats are UPF 50+, comfortable for all-day wear, and stay on while swimming without constant adjusting.

What is the difference between a swim hat and a regular sun hat?

Regular sun hats are stylish but not made for water. They fly off when you swim. Nammu swim hats are made for in-and-out water use and stay on.

Do I still need sunscreen with a swim hat?

Yes, on the rest of your body. The hat covers your head, ears, and neck. Use sunscreen everywhere else as usual.

Are Nammu swim hats UPF 50+?

Yes. All Nammu swim hats are UPF 50+.

Do Nammu swim hats come in kids and adult sizes?

Yes. Nammu makes swim hats for babies, kids, and adults in a range of sizes and styles.