This long-sleeved T-shirt uses Merino Wool Plus™, which combines the warmth of wool with excellent quick-drying properties. It's suitable as an inner layer in winter, or as an outer layer for high-altitude climbing in summer or trekking in cooler seasons. It's also easy to wash at home. Specifications: 【Material】 Merino Wool Plus™ 83% Wool + 17% Polyester 【Average Weight】180g 【Color】Gray 【Size】S 【Features】Flat Seam / Spiral Slantec® Cuff. Long-sleeved gray T-shirt with a simple design and a round neck for comfortable wear. Thank you for viewing. I've only used it a few times for mountain climbing, so it's still in great condition. It runs a bit large, and it fit me perfectly even though I usually wear a size M. Thank you.