{HEAD ~ An additional layer}, which is made of same or different material and configured with same or different surface pattern variations, may be added to the pad at {TAIL ~ its lower and upper surfaces} for extra comfort and friction 
added at
{ HEAD ~ An additional layer } , which is made of same or different material and configured with same or different surface pattern variations , may be added to the pad at { TAIL ~ its lower and upper surfaces } for extra comfort and friction
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH