[B]Canvas made of high quality poly-cotton canvas elastic gusset in crotch, 4-way leg bottoms made of CORDURA to extend by 4 cm triple seams aesthetically made, covered seams inside TEFLON - apreture of the fabric Oeko-Tex certificate strong, metal YKK zipper mesh ventilation with zipper on 2 sides CORDURA knee pockets for PU foam inserts assembler pockets detachable with YKK zipper numerous functional pockets made of CORDURA belt reinforcing tape - trouser gusset with non-slip elastic band