Soft 500 denier polyester / 900 denier blended perforated mesh provides maximum airflow Side cinch strap system allows for waist expansion Cowhide leather on the knee for maximum durability, added grip and heat protection Full nylon mesh liner Double and triple stitching in critical stress points for maximum strength Sliding rear yoke stretch system allows the pants to stay in place Lightweight TPR logo patches on thigh for added protection and style Oversized 4-way stretch crotch design provides race fit comfort Articulated 2-way stretch rear knee and calf panel and accordion stretch in front knee to accommodate protection Tailored, athletic fit for maximum comfort and performance