Any bonehead claiming they ride 40 degree water in boards shorts is full of sh it. When you go out for a few hours at a time there is no messing around with cold water. Even on the beach when you're dripping and there is wind you don't warm up unless air is above 60+. You get disconnected from your ski or have any engine trouble and you're time in the water is limited. When you can't feel your hands, feet, and your muscles start to stiffen up you're not having a good time. You can pretend you're a tough guy all you want, but you're not fooling anyone