The Women&';s Expedition 1/4-Zip Top is the new standard for what a baselayer should be. Featuring our new, lofted DUAL SURFACE(TM) Precision Blended Wool, which creates a super warm, yet breathable fabric. Also including a thin inner layer of high-performance wicking yarns that pull sweat off the skin to keep you dry all day. This will become your on the go piece for all day warmth, breathability, durability, and overall comfort. weather activity features DUAL SURFACE(TM) Precision Blended Wool Integrated Thumb Loops Fabric Weight: 285 g/m2 Garment Weight: Women&';s M = 354 g (0 lb. 12.5 oz.) Fabric Made in Japan | Garments sewn in Vietnam