The GP Pro Air pant was created colely to deal with the stresses put on your body through humidity and heat. The mesh polyester construction handles the high heat coming in by allowing it to cool the lower body while hotter exhaust temperatures exit through rear, lower leg "one mesh" panels. The combined performance of the knee, side and rear upper yoke stretch panels along with the durable 600D polyester gives the rider an unmatched level of comfort and durability at an attractive value.