I had been looking around for a bed mat to place on top of the liner and, I did not want to pay for a custom mat. The ribs on that bed liner just kill my knees. Found suitable material at Costco. They have 3' x 3' interlocking heavy rubber non slip anti fatique mats there for $14.99. Three mats with a bit of trimming will work out just fine for the short box on my S'screw.

2006 FX4 Super Crew
5.4
3:55 axle
leather
Tinted windows
20" rims

 

Thats cool, as long as you alreadsy have a liner layed down in the bed, because thick rubber holds water inplance if it cannot escape, and that means rust. I know what you mean though the lined design really hurts the knees, and hands.