Built from the lightest and toughest Merino wool in the industry, the ULTRA Merino 120 LT short sleeve crew harnesses all the natural performance benefits of Merino. It excels as a standalone hunting shirt in the heat, or base layer in the cold. WEIGHT 4.5 oz / 128 g (L) PROTECTION UPF 50+ Rating, Naturally Odor Resistant MATERIAL Nuyarn Merino- 70% Merino / 30% Nylon CONDITIONS Hot to Cold Hot - (70°F + / 21°C+) Cold - (32-45°F / 0-7°C) LAYERING POSITION Base Layer