nwot Featuring Nuyarn® Merino technology, the 145 Zip-T features a thermoregulating, mid-weight Wool Nylon blend, making it our most versatile next-to-skin or layering option. WEIGHT 8 oz / 227 g (L) PROTECTION UPF 50+ Rating, Naturally Odor Resistant MATERIAL Nuyarn Merino- Body: 90% Merino Wool / 10% Nylon | Side: 83% Merino Wool / 17% Nylon CONDITIONS Cold - (32-45°F / 0-7°C) LAYERING POSITION Base Layer