Icebreaker Men's Tech Lite Long Sleeve Crewe Seven Summit Stack Four seasons worth of trails, travels, and active pursuits. With capabilities as varied as the adventures you'll take it on, the Tech Lite features our corespun fabric, which uses nylon fibers wrapped in merino wool to provide added strength and durability while maintaining next-to-skin softness. Original screenprint artwork Zachary Snyder provides a topography lesson in the world's highest peaks. Features: FABRIC WEIGHT: 150 Ultralight FABRIC: 87% Merino Wool / 13% Nylon PRODUCT WEIGHT: Medium = 192 g / 6.77 oz