: I do a lot of whitewater kayaking, and we generally wear neoprene
: booties. I've been swimming in 25F weather and felt warm enough
: to want to take some stuff off. That's with a full dry suit, and
: I would recommend you not even think about going out in 40F
: water without one, as well as never go alone. Cold water
: substantially increases the danger level of kayaking.

Good point. 40 degree water definately will require a dry or at least a semi-dry suit.

Those with socks make footwear a much easier choice also "MUCH" easier to put on and take off, trust me, when you have to pee, taking the suit off in a hurry becomes important .

Bill H.