The Windbreaker Long Sleeve uses the same material blend you see in many Super.natural clothes: its Merino wool content evens out fluctuations in heat, keeping you comfy during both exercise and breaks, while the polyester enhances both durability and moisture transfer. This top is relatively thin, and this combined with the wind barrier front panel makes it a somewhat rare product, allowing you to vent your main windbreaker or shell jacket without feeling the wind directly on your skin. - Main material 50% Merino wool and 50% polyester, material weight 140g/m² (relatively thin) - Thin but effective softshell wind protection at front panel (78% Nylon, 22% elastane) - Sides with extra breathable, mesh-like fabric (49% merino, 47% polyester, 3% Nylon, 1% elastane) - Machine washable, follow instructions in package