CleanSpace liner is a very tough 20 mil, seven-ply barrier. It consists of three layers of high strength polyethylene film laminated together with two layers of molten polyethylene, with two layers of polyester cord reinforcement sandwiched in-between. It is blue on one side and bright white on the other. It provides exceptional impact and puncture resistance and brute tear resistance. Both the white and blue sides are protected with UV stabilizers. CleanSpace is treated with UltraFresh antimicrobial finish to prevent mold growth.