Our favourite swim shirts for warmth and UV protection in 2025

When the conditions change throughout the warmer months of the year, spending 20 minutes trying to pull on your wetsuit might not always be necessary. That’s when the lesser-spotted swim shirt comes into its own.

Swim shirts, also known as rash guards or vests, are designed to offer a degree of sun protection, making them a useful tool for swimming, surfing, or paddle boarding.

Given the potential for damage from UV rays, it can be a great way to ensure you’re protected without needing to apply (and reapply) sunscreen, which is always in danger of being washed off in the water.

A good swim shirt can also reduce chafing and irritation that can occur in saltwater or chlorine, and provide some insulation against water that isn’t quite cold enough for a wetsuit but still requires some coverage.

There are a number of thicknesses for different temperatures and textures. Most swim shirts are around 1-2mm in thickness, but can also come in around 3mm for added warmth. The sun protection is determined by the UPF (ultraviolet protection factor) rating, which usually ranges from UPF 15 to UPF 50+.

We’ve included options for both men and women, as well as short- and long-sleeve options. The picks below were chosen based on in-depth research and analysis of user reviews.

Best swim shirts in 2025

1. Roxy Whole Hearted Women’s Long Sleeve Rash Vest

Surfing industry giant Quiksilver’s women’s line, titled Roxy, has been going strong since 1990. They initially began as a swimwear brand and have since expanded to snowboarding and surfing, manufacturing the first pair of board shorts marketed towards women.

This long-sleeved rash vest is made from recycled fabric, and is stated to offer a stretchable fabric and a fitted design. There’s Roxy’s branding on the left sleeve and the front, with a wider collar designed to provide a little extra comfort for the neck.

The fabric also offers a UPF of 50+ to keep your skin protected.

2. Quiksilver Short Sleeve Rash Vest

A mainstay in Quiksilver’s men’s line, this short-sleeved rash vest is made from recycled yarn, which they claim to be saltwater resistant.

It’s stated to have a snug fit, with a high collar and Quiksilver branding on the left sleeve and the centre of the chest.

It offers UPF protection of 50 and is available in up to six different colours, including an eye-catching orange and a speckled navy.

3. Olaian 100 Men’s Long Sleeve Surfing Top

Olaian’s swim shirt is said to have been manufactured with surfers in mind, with a long-sleeved design and UPF 50+ fabric, which is claimed to maintain protection when wet.

It’s made from a textile mesh, which Olaian claims prevents grains of sand from getting stuck in the fabric.

It also features a loop that can be attached to board shorts or swimming trunks, which is designed to keep the top from being moved or pulled up when hit by waves, ensuring there isn’t any unwanted skin exposure.

4. O’Neill Basic Sun Tee Shirt

Another surfers’ favourite, San Francisco brand O’Neill have been making neoprene wetsuits and rashguards for the best part of half a century.

Their men’s swim shirt is designed to offer a slightly looser fit for swimmers and surfers who feel like skin-tight fits aren’t for them.

It’s said to feature seamless zones where you’re likely to move your arms when paddling or swimming. This is down to flatlock seams, which claim to be soft and breathable throughout long periods of exercise.

The fabric is stated to be quick drying and offer UPF 50+ protection. There is a board short connector too, designed to keep the shirt from riding up while you’re in the water.

5. Arena Short Sleeve Rash Vest

Arena’s short-sleeve rash guard is designed to offer a seamless feel, with flatlock seams to prevent chafing.

It’s said to feature a slightly more relaxed fit than snug rash guards, with contrast stitching and Arena’s branding on the chest.

The polyester fabric offers a UPF rating of 50+, with a high neck and a longline waist. It’s available in the fetching navy-blue colour pictured above, with a long-sleeve option also available.

If you’re swimming in the summer months, you may need to apply sun cream too. See our top sunscreens for swimmers and stock up on high-performing creams to block UV rays.

Features to look for in a swim shirt

UV protection

Look for swim shirts and rash vests with a high UPF rating (ideally UPF 50+) to shield your skin from harmful sun exposure—this is especially important for long sessions swim sessions outdoors.

Fit and sizing

Go for a snug yet flexible fit that stays in place as you move and swim about, without restricting movement. You can choose between fitted or relaxed cuts if you have a preference, but typically swim shirts are more comfortable when they sit snug to the skin to avoid rubbing and drag in the water.

Comfort

Flatlock or seamless stitching helps reduce rubbing, making the vest more comfortable during extended wear, especially when surfing or swimming.

Fabric

Quick-drying, lightweight fabrics like polyester, a nylon blend, or eco-conscious fabrics with elastane are ideal for breathability and quick-drying ability. They can also help manage moisture and keep you feeling comfortable between dips.

Chlorine resistance

For pool use, look for chlorine-resistant fabrics to prevent fading and wear. Reinforced seams boost longevity, especially with frequent use.

Breathability

Choose breathable, moisture-wicking materials to stay cool and avoid that sticky feeling—especially useful when layering or wearing out of the water.