Cold water is different in Florida and Canada! Water tops out at 80 in the north and we ski water in the High 40's by end of season. 70 degree water feels faster then 85 water BUT once water is in the 55 range it is like sandpaper between ski and water and feels really slow and hard to get the ski to move. Let's define what temp is warm? 70, 80, 90? and what is Cold water 40's, 50's or 70's?