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