Seal skin has the aesthetic edge for wonderful custom bows. In a hunting setting I can see very little advantage to my seal skin rests over several other products I've used. The soft leather in it makes it less than ideal for staying in place under any and all weather conditions...especially in wet/humid environments.
For pure hunting serviceability, Shedrock nailed it. The soft or 'loop' side of sticky velcro is unsurpassed for durability, quiet and adhesion. Easy to carry more in your possibles bag, too.