Terramar knows how to engineer natural fibers for a performance base layer. We have been doing it for more than forty years. The Thermawool Women's Half Zip is designed to keep you warm, dry and comfortable in the mountains, in the woods and any other place you look for challenges. The secret is blending merino wool with just the right amount of microfibers to make the ideal technical fabric to breathe and manage moisture. We got it right! Features: Rolled forward shoulder seam Zipper garabe Wide waistband for extra support and comfort Stretch comfort neck tape All flat seam and active flat seam construction Brushed microfiber against the skin for no itch Midweight warmth and superior breathability Flat seam construction for comfort UPF rating 50+ Machine Washable Outside: 70% polyester/30% meriono wool Inside: 100% polyester Weight: 180gsm Technology: Climasense Thermoregulation Technology Engineered to adjust to your body temperature Inhibits the growth of bacteria that causes odor Fast wicking and drying Terramar Women's Thermawool 4.0 Half Zip Pullover