Wetsuit Thickness Guide: What to Wear in Every Water Temperature

Nothing ruins a surf trip faster than the wrong wetsuit — too thin and you're shivering after 40 minutes, too thick and you can't paddle. This guide gives you the exact thickness for every water temperature, plus the fit rules that matter more than any brand name.

How Wetsuit Thickness Works

Wetsuit thickness is written as two (or three) numbers in millimetres: a 3/2mm suit has 3mm neoprene in the torso panels and 2mm in the arms and legs. Thicker torso = warmer core; thinner limbs = better paddling flexibility. A third number (e.g. 5/4/3) indicates a mid-weight zone, usually the legs.

The Temperature Chart

• 24°C+ (tropical — Bali, Sri Lanka, Costa Rica): Boardshorts or a 1mm rash top for sun and rash protection.
• 20-23°C: 2mm shorty or neoprene top — early/late season tropics, Canaries in summer.
• 17-19°C (Portugal summer, Morocco, Canaries winter): 3/2mm full suit. The most useful suit most surfers will ever own.
• 14-16°C (Portugal winter, northern Spain): 4/3mm plus 3mm booties.
• 10-13°C (UK/Ireland autumn, France winter): 5/4mm hooded, 5mm booties, 3mm gloves.
• Below 10°C: 6/5mm hooded, 7mm booties and mittens — and respect.

Fit Beats Everything

A €200 suit that fits beats a €500 suit that doesn't. The suit should feel like a firm handshake everywhere: no gaps at the lower back, no bagginess behind the knees, no neck choke. Raise your arms overhead — if the suit restricts you badly or a pocket of air moves, try another size. Always check the brand's size chart; sizing varies dramatically between manufacturers.

Zip Types: Chest vs Back

Chest-zip suits are warmer (less flushing) and more flexible, but trickier to wriggle into. Back-zips are easy on/off and fine for summer suits. For anything 4/3mm and up, go chest-zip or zip-free; the warmth difference in winter is real.

When to Rent vs Buy

If you surf fewer than 10 days a year and always in camps, rent — every camp on our directory includes suitable wetsuits. Buy your own once you surf regularly at home or hate the idea of shared rubber. A quality 3/2mm from a mainstream brand runs €150-280 and lasts 3-5 years with freshwater rinses and shade drying.

Care: Make Your Rubber Last

Rinse in cold fresh water after every session, dry inside-out in the shade (UV kills neoprene), never use a hard hanger on the shoulders, and never machine wash. Small cuts are easily fixed with neoprene cement — repair early before they spread along the seam.