The WS.1 Original Work Short is made from 8.2 ounce (280gsm) Tensile 280™ cotton canvas with DURA500™ Advanced Nylon and Polyurethane Canvas abrasion. 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.