When using cold water for cooling effects, it should not be ice water or excessively cold, as this can cause vasoconstriction and prevent heat transfer.

“Ice cold is too cold. So people always ask, well, why can't you just stick your hand in a bucket of ice water? It's too cold. What that does is that causes reflex, a vasoconstriction of the very portals that you're trying to maximize the heat loss from.”