Our warmest synthetic baselayer keeps you dry and warm in cold conditions. Great stretch, breathability and compressibility. Warm brushed-fleece interior moves moisture quickly to the face of the fabric. Durable smooth jersey face slides easily beneath layers. Zip-neck for easy climate control is backed by draft flap and zipper garage. Set-in sleeve seams won't chafe beneath straps. Engineered thumb loops; drop-tail hem. Machine-wash cold, tumble dry at low temperature. Solids: 5.9-oz Polartec® Power Dry® 94% polyester (53% recycled)/6% spandex. Heathers: 5.9-oz Polartec Power Dry 94% polyester (52% recycled)/6% spandex. Both have Gladiodor® odor control for the garment. 218 g (7.7 oz) Made in Costa Rica.