Well let the virtue of the button up Marmot Men's Muir Insulated Long Sleeve speak for itself. The midweight performance woven cottonpolyester cloth quick drying and durable with a soft cottony feel is filled with 60 grams of synthetic Thermal R insulation for supreme comfort while maintaining a causal look. Adjust the cuffs, slide your hands in the pockets and boogie. Double chest pockets interior corduroy yoke. Granite Cloth 60% cotton, 40% polyester construction, 7.5 oz.yd. Midweight, performance woven fabric is polycotton blend for comfort. Thermal R 60 gram insulation. Handwarmer pockets. Chest pockets with button closure. Interior corduroy yoke and side vent. Adjustable cuffs. Regular fit. Avg. wt. 1 lb. 13 oz. 822.1 g. Center back length: 29.5.