Pearl iZUMi Men's Fly Softshell Run Jacket 100% Polyester Back Panel: 100% Polyester Imported Stretch Thermal Windblocking fabric provides optimal wind protection, warmth and breathability for high aerobic outputs Thermal Fleece fabric strategically paneled to deliver superior breathability, moisture transfer and warmth 2 zippered hand pockets keep your fingers warm, while providing storage for small essentials