The purpose of a PFD is to help keep you afloat. If you are going to be playing in extremely cold water, you might consider adding a wetsuit underneath the life vest. Although wetsuits perform differently, they can provide warmth that will keep your body warm if you are immersed for more than 30 seconds in cold water. They can also help you stay above the water, even though they are not designed to replace a personal flotation device (PFD).