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