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Why You Actually Need a Rash Guard

Most people underestimate how quickly the sun does damage in or near the water. Water reflects UV, sunscreen washes off after 80 minutes even when “water resistant,” and cumulative exposure over a beach week is genuinely risky. A rash guard is the simplest, most reliable sun protection for the upper body — you put it on once and don’t think about it again.

The other function is right there in the name: rash prevention. If you’re bodyboarding, surfing, or doing any paddling activity, skin-on-board or skin-on-wetsuit contact causes painful rashes (technically abrasions) on chest, belly, and underarms within hours. A rash guard completely eliminates this. They also provide thermal regulation in cooler water — the thin layer adds just enough warmth to extend your comfort zone without restricting movement.

What to Look For in a Rash Guard

UPF rating: Look for UPF 50+ — this blocks 98% of UV rays. Anything below UPF 30 isn’t worth the fabric. Nearly all quality rash guards from major brands hit UPF 50+.

Long vs. short sleeve: Long sleeve is the obvious winner for sun protection — covering your entire arm matters. Short sleeve is more comfortable for surfing in warm water where movement range matters more than complete coverage. For snorkeling, kayaking, or general beach days, go long sleeve always.

Fit: Rash guards should be snug but not restrictive. Loose rash guards bunch up in the water and create drag. Too tight and they restrict paddle range. Most brands offer a “relaxed fit” (slightly looser, more comfortable for casual wear) and a “compression fit” (tighter, better for surfing and water sports performance).

Material: Most rash guards are polyester/spandex blends. Higher spandex percentage = more stretch and comfort. Flatlock stitching (seams sewn flat) is better for long wear — it won’t chafe. Check for this specifically if you’re buying for surfing or long sessions.

Best Rash Guards — Our Top Picks

Long Sleeve vs. Short Sleeve — When to Choose Which

Rash Guard Care & Longevity Tips

A quality rash guard should last 3–5 seasons with proper care. The main enemy is chlorine (which breaks down spandex fibers) and heat (which sets stains and degrades elastic). Rinse your rash guard in fresh water immediately after every use — salt water and chlorine left to dry in the fabric will break it down fast. Machine wash cold on a gentle cycle; never put it in the dryer. Hang dry flat or on a hanger away from direct sunlight.

Sunscreen, particularly chemical sunscreens containing benzophenone or avobenzone, can cause permanent yellowish staining on light-colored rash guards. If you care about color, apply sunscreen before putting on the rash guard and let it absorb, or choose a mineral sunscreen. This affects light gray and white rash guards far more than black or navy.

Frequently Asked Questions