Anything made of rubber is a no-no for me as I like the bow to slide into my hand where it belongs without inducing any kind of torque. That and I like as small a grip as possible for the same reason. To that end I sometimes take the grip off the bow and shoot right off the riser. Can my hand get cold from the riser? Sure, but I don't hold my bow much while on stand and keep my hands in my pockets for warmth.