From the website: Technical trekking tights for autumn and winter days on the trail. Made from an abrasion-resistant stretch fabric in recycled polyester and elastane, with a brushed inside and wind-blocking panels on the front and sides. High-stretch Cordura reinforcements over the knees and reflective details for visibility in low-light conditions. The wide waistband with inside drawcord gives a secure, snug feel. Two leg pockets for a compass and other small items you want close at hand.