Matterhorn Convertible Pant - Men's Regular Length by Mountain Hardwear nylon Especially strong, with doubled fabric panels at the knee and seat for added reinforcement. Easy to move in, with a gusseted crotch and fully articulated knees. Strategically placed pockets which are easy to reach and large enough to hold important items. Zip-off panels make them easily Convertible to shorts without having to remove shoes or boots. Incredibly comfortable with a micro-chamois lined waistband for added comfort even while wearing a backpack.