- Size: M - Smartwool SW016953 men's thermal shirt, made from high-quality merino wool - Ideal as a base layer for all seasons thanks to its breathable, temperature-regulating fabric - Nylon core provides strength and durability, while maintaining the softness of merino wool against the skin - Ergonomic design with flat seams and adapted shoulders to prevent chafing when carrying a backpack - Color: Iron Heather, size M, comfortable and practical fit - Responsible plant-based dyeing technique used in some colors - Lightweight garment, quick-drying and easy to care for - Perfect for sports activities, hiking, mountain use, or daily wear in cold climates