A wetsuit that's the wrong size doesn't just feel uncomfortable — it stops doing its job. Too loose and water flushes through, taking your body heat with it. Too tight and it restricts your breathing and movement, and puts pressure on the seams every time you bend. Getting the size right matters more with a wetsuit than almost any other piece of gear.
Why sizing charts vary by brand
Neoprene doesn't stretch and fit the way regular fabric does, and every brand cuts differently. A Medium in Cressi won't fit the same as a Medium in Mares or Rob Allen. Height and weight alone are only a starting point — always check the specific brand's size chart rather than assuming your usual size carries across.
What a good fit feels like
A wetsuit should feel snug everywhere, with no loose material or gaps at the neck, wrists, ankles or lower back — those are exactly where water flushes in. Some initial resistance when pulling it on is completely normal for neoprene; it's not supposed to go on as easily as a t-shirt. It should never restrict your breathing or feel like it's cutting in when you bend forward.
Give it a chance to break in
New neoprene is at its stiffest straight out of the packet and softens slightly with wear. If a suit feels close but not quite right on the first try, a couple of dives is often enough to tell whether it's genuinely too small or just new.
Use our Size Guide
We've put together an interactive Size Guide with the exact measurements for each brand we stock, so you can check your fit against the actual chart before you buy rather than guessing off a generic size label.
Once you know your size, shop Scuba Diving, Spearfishing & Freediving and Snorkelling wetsuits.