Mountain Hardwear Microstretch Zip-T - Men's polartec-fleece Stretch fleece side panels and underarms for mobilityBody, Velous Micro Fleece (100% polyester) Zip arm stash pocketPanel, Stretch Fleece (93% polyester, 7% elastane) Flat-lock construction for comfortAvg. weight, 10oz / 283g High-cut collar with 12" zip to vent heat Apparel Fit, Semi-Fitted