Black Line Layout Shooting Mat is made with 600D poly fabric construction with weatherproof vinyl coating. Compact and has a roll up design. Features dual side accessory pouches, three bipod secure strips, 1/4" closed cell foam padding, and adjustable 1/2" thick knee padded section. The zippered knee section allows for additional padding. The dimensions of the mat fully deployed are 80 x 29 including the fold out flaps. The zippered knee section is the only place where extra padding can be added.