wetsuit 5/3 what does it mean?
Wetsuit thickness is usually given with two numbers like 3/2, 4/3, 5/3, or three numbers like 5/4/3. The numbers mean that the thickness of the neoprene is 3 millimetres (or 4 or 5) on the body (and legs with winter suits) and 2 millimetres on arms (and legs with spring suits).