The WP.1 original work pant is made from 8.2 ounce (280gsm) Tensile280™ cotton canvas with DURA500™ advanced nylon and polyurethane canvas abrasion panels. DURA500™ is a 500 denier nylon oxford treated with polyurethane for high tensile strength and performance durability. DURA500™ provides long-lasting enhanced tear and abrasion resistance.