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Fabric protection does not wash off, sweat off, or need reapplying every two hours. That is its main advantage over lotion for swimmers spending long stretches in the water.

You generally do not need sunscreen underneath a UPF 50+ stinger suit. The fabric is already doing that work.

What you do need is coverage for exposed skin — face, ears, hands, feet, and any gap at the neckline or wrist. Apply a broad-spectrum, water-resistant sunscreen to those areas before you get in.

A stinger suit and sunscreen work as a pair, not as alternatives. The suit handles the torso, arms, and legs; sunscreen handles what the suit does not cover.

Sun Exposure in and Around the Water

UV radiation does not stop at the surface. It penetrates water, and you can still burn while swimming a metre below.

Water, wet sand, and pale pool decks all reflect UV back toward you, which increases total exposure. Beachgoers standing in shallow water often receive more than they expect.

Two details affect a suit's real-world performance:

• Wet fabric — some materials lose UPF effectiveness when saturated, though the tightly knit nylon-elastane blends used in stinger suits generally hold their rating
• Stretch — a suit pulled too tight opens the knit structure and lets more UV through, so avoid sizing down

Faded or worn fabric also blocks less UV. Replace a suit once the colour has visibly dulled or the material has thinned.

Fabric, Construction, and Coverage Features

The protection a stinger suit delivers comes down to how tightly the fabric is knitted, how smooth its surface is, and how much skin stays covered. Fibre type, seam construction, and closures at the wrists, ankles, and neck all change how well the barrier holds up in the water.

Tight Weaves and Smooth Fabrics

Fabric density matters more than the name printed on the label. The 2009 Gershwin and Dabinett study comparing eight types of protective clothing against Irukandji stings found that tighter weaves excluded tentacles more effectively, and smoother surfaces resisted tentacle adherence.

Irukandji tentacles are extremely fine. Loose knits leave gaps that stinging cells can reach through, which is why compression-style fabrics with a dense knit are common in quality suits.

Surface texture works the same way. Rough or fleecy fabrics give tentacles something to cling to, extending contact time, while slick synthetic surfaces let them slide off.

Density also drives UV performance. A tightly knitted UPF 50+ fabric blocks over 97.5% of UVA and UVB radiation, and that rating should hold when the fabric is wet and stretched.