Wetsuit Thickness Comparator

Last updated 2026-08-17

Wetsuit buying guides almost all reduce to one chart: a water temperature, a millimetre number. The closest thing to a comparison we found, The Free Surfer's wetsuit thickness guide, lists Rip Curl, O'Neill, Xcel and Patagonia in a "brands" section — but its own chart is one single blended recommendation, the same for every brand. We fetched three brands' own current guides directly instead. At 60°F, Rip Curl's and Billabong's own charts both say 3/2mm; O'Neill's own chart (18–20°C, which 60°F falls inside) says 3/2mm or 4/3mm — a thicker suit for the same water.

This is a starting point, not a rule All three brands say the same thing in their own text: wind, how active you are in the water, and your own cold tolerance change the right answer as much as temperature does. Rip Curl's own page says the "five-degree overlap" between adjacent bands "is where most of the deliberation happens." None of that is modelled here — this tool only reports what each brand's own chart says for the temperature you enter.

Why we read the boundary the way we do

Each brand's own chart repeats the boundary number at both ends of adjacent bands — Rip Curl lists "60–65°F" and "65–75°F" both containing 65. We read each band as starting at its own printed lower number and running up to the next band's lower number, so 65°F itself gets the warmer (2mm) band. This is a reading, not a number any brand states outright, and it is applied the same way to all three brands so the comparison stays fair.

What this does not do

It does not cover diving, only the three brands' own surf guides — wetsuit thickness advice for scuba and other still-water sports runs thicker for the same temperature and is a different market.
It compares three named brands, not the whole market. A brand not listed here may recommend something different again.
The "spread" number below is arithmetic on each brand's own first-quoted thickness figure, not a fourth recommendation — always check the linked brand page for its full band and caveats.

Runs entirely in your browser. Nothing you type is sent anywhere. If "named sources disagree, shown side by side instead of blended" is useful here, the turkey roasting time comparator does the same thing for Butterball, Jennie-O and Honeysuckle White's own roasting charts, and the cooler ice retention comparator found one major brand (YETI) that refuses to make the kind of claim the others on this page do.