Search for "best rash guard" and you get surf shirts, gym compression tops and swim tees all mixed together. A rash guard that is great for a surf session can be a bad choice for diving: too loose under a wetsuit, too short in the sleeve, or with seams that rub where your BCD straps sit. This guide is about what makes a rash guard good for diving and snorkeling, so you can judge any shirt, ours or anyone else's, before you buy it.
The short answer
The best rash guard for scuba diving is long-sleeved, snug, quick-drying and stretchy, with flat seams and a fabric that blocks the sun. It should fit close enough to slide under a wetsuit without bunching, and be comfortable enough to wear on its own all day on the boat. Everything else, including the print, is personal taste.
7 things that make a rash guard good for diving
1. Long sleeves
Short sleeves leave your forearms bare to the sun on the surface and to stings and scrapes underwater: fire coral, hydroids, jellyfish tentacles, the boat ladder. For diving and snorkeling, long sleeves are the single biggest upgrade. They also stop the wetsuit cuff from rubbing your wrists.
2. A snug, second-skin fit
A loose rash guard fills with water, drags when you kick and bunches up under a wetsuit. A dive rash guard should sit close to the body without pulling across the shoulders. If you plan to wear it mostly under a wetsuit, choose the closer fit. If you mostly snorkel and like a little room, size up. Always check the size chart: sizes differ a lot between brands.
3. 4-way stretch
Diving means reaching back for a hose, rolling off a boat and kicking for an hour. Fabric that stretches in both directions moves with you instead of pulling at the neck and armpits. Give the fabric a pull in both directions: it should spring back right away.
4. Flat (flatlock) seams
Thick, raised seams are fine at the gym and painful under a wetsuit, a weight belt or BCD straps. Flatlock seams lie flat against the skin, so nothing digs in after the second dive. Turn the shirt inside out and run your fingers over the shoulders and sides: you should barely feel the seams.
5. Built-in sun protection
Snorkelers and divers on the surface lie face down with their back to the sun, often for an hour or more. A rash guard is the easiest way to cover the back and shoulders without layers of sunscreen. Look for fabric with built-in UV protection, and keep sunscreen (reef-safe) for your face, neck and hands.
6. Quick-dry fabric
On a two-tank morning you want the shirt dry again before the second dive. Lightweight polyester-spandex blends dry fast in the sun and wind. Heavy cotton-feel fabrics stay wet and cold.
7. A print that won't crack or peel
Salt water, sun and sunscreen destroy cheap plastic-style prints. With all-over sublimation printing, the ink goes into the fabric itself, so the design does not crack, peel or wash off. This matters if you want the shirt to still look good after a season of dive trips.
Mistakes to avoid
- Buying a surf or gym shirt for diving. Many are short-sleeved, cut loose or have bulky seams.
- Going a size too big "to be safe". Under a wetsuit, extra fabric folds and rubs.
- Expecting a rash guard to keep you warm. It adds a little comfort, but for real warmth you need a wetsuit or, in warm water, a full dive skin. Our article dive skin vs rash guard explains the difference.
- Using the tumble dryer. Heat wears out the stretch faster than anything else.
Our picks, by type of diver
All our rash guards are long-sleeved, with built-in UV protection, quick-dry 4-way stretch fabric and flatlock seams, in sizes XS to 4XL. They are designed by divers in Greece and made to order. The difference is the print, so pick by the animal your diver loves:
- Our best seller: the Dive Stingray men's rash guard, with a big stingray across the back. The women's version is the women's Stingray rash guard.
- For shark divers: the Hammerhead rash guard, for anyone who hangs in the blue hoping to see a school go by, or the Born Shark rash guard.
- For snorkelers: the same shirts work perfectly on the reef. See them all in our snorkeling rash guards, and read what to wear snorkeling for the full packing list.
- For women: browse every print in women's rash guards.
Want more detail on fit and layering? Our guide on how to choose a scuba diving rash guard goes step by step.
How to make a rash guard last
Rinse it in fresh water after every dive, wash it cold, and dry it in the shade. Skip fabric softener and the dryer. Treated this way, a good rash guard keeps its fit and color for many seasons.
Quick answers
What is the best rash guard for scuba diving? A long-sleeved, snug, 4-way stretch rash guard with flat seams, quick-dry fabric and built-in sun protection.
Should a rash guard be tight or loose for diving? Snug. Close enough to sit flat under a wetsuit, but not so tight that it pulls across the shoulders.
Is a rash guard good for snorkeling? Yes. It protects your back and shoulders from the sun while you float face down, which is when most snorkelers burn.
Can you wear a rash guard under a wetsuit? Yes. It makes the wetsuit easier to put on and take off, and stops rubbing at the neck and arms.
Long sleeve or short sleeve? Long sleeve for diving and snorkeling: more sun protection and protection from stings and scrapes.