Actually, you should maintain the core of the body with extra insulation and wrapped heat packs if at all possible, not the extremities. As it has been mentioned in previous posts, wet cotton clothing should be removed. Depending upon the type of other fabrics (wool, polypro, fleece) worn, it may be better to wring out the excess water and leave the damp clothing in place, especially if you can add layers of insulation, add wrapped heat packs and then wrap everything (patient, clothing and/or insulation) with a vapor/wind barrier such as a plastic tarp, plastic trash bag or plastic sheeting.

Rewarming or insulating the extremities can be dangerous, in that the blood vessels in the extremities will start to dilate, causing cooled blood to be transported to the core where life-threatening cooling can occur. Pete