Elastomers useful in the practice of this invention may be those made from copolymers such as polyurethanes, copolyether esters, polyamide polyether copolymers, ethylene vinyl acetates (EVA), block copolymers having the general formula A--B--A' or A--B like copoly(styrene/ethylene-butylene), styrene-poly(ethylene-propylene)-styrene, styrene-poly(ethylene-butylene)-styrene, (polystyrene/poly(ethyle