Rash guards aren't just for surfers.

Wear one whenever you’re in the water for more than a quick dip, especially if you’re paddling, bodysurfing, or playing volleyball.

A rash guard is basically a tight-fitting swim shirt made of spandex or nylon. It protects you from the sun (UPF 50+ typically), prevents chafing from sand, board wax, or your own skin, and keeps you slightly warmer in cool water. It also means less sunscreen slathering — which is nice if you hate how greasy you feel after four reapplications.

When not to wear one? If you’re just sitting on a towel reading, a regular shirt works fine. But if you’re moving, a rash guard outperforms a wet cotton t-shirt every time. That soggy tee will chafe, sag, and offer almost no sun protection.

If you do one thing this beach season,