WeatherTech 32U6611 Toyota Tundra UnderLiner Pickup Truck Bed Liner WeatherTech underliner bedliner Tundra Box Size: Short Box (5' 6") Part Number: 32U6611 WeatherTech UnderLiners are designed exclusively as a protective layer between the truck bed and an additional rigid Bed Liner Do not use the UnderLiner without installing an additional rigid Bed Liner to secure it in place.