Wetsuits are designed in a "tight/snug fitting" to keep warm 3/2 MM : 3mm torso / 2mm arms and legs, suggest for over 59F water, Flatlock stitching, Tips: / [important] Read size chart first / A proper fitting wetsuit will be challenging to put on when dry. (Pro Tip: Keeping your socks on will allow your feet to slide in much easier!) / There should be no excess room in the torso, crotch, shoulders or knees. / Once on, lift your arms over your head and stretch out your shoulders. This move should only be slightly restricting. / You should be able to squat down and move your arms easily