{TAIL ~ The process} 1, wherein the mat comprises synthetic felts, synthetic fabrics, {HEAD ~ natural felts} or natural fabrics 
{ TAIL ~ The process } 1 , wherein the mat comprises synthetic felts , synthetic fabrics , { HEAD ~ natural felts } or natural fabrics
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH