Weighing in at just under 3.5 oz, the Tech Tank is your new best friend on hot summer days. Built with VOORMI&';s DUAL SURFACE(TM) UL Precision Blended Wool, it&';s equal parts wicking, breathable, sun-protecting and odor-preventing for even your toughest workouts. Perfect for a day on the river, running in the desert or simply enjoying the scenery. weather activity features DUAL SURFACE(TM) Precision Blended Wool Fabric Weight: 120 g/m2 Garment Weight: Men&';s L = 131g (0 lb. 5 oz.) Fabric Made in Japan | Garments sewn in Vietnam