3 ply fabric, and rubber on only the one side. Just at or a bit under .250"
Because of the single sided nature, you can score through the fabric and then fold open the rubber a bit so it does not bind.
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2007 Dodge Ram 3500 SRW 4x4 with 6MT
2003 TDI Beetle
2002 TDI Beetle
currently parked - 1996 Dodge 2500 Cummins Turbodiesel
Custom cab, auto, 3.55 gears