We reach for the Sphere II Short-Sleeve T-Shirt every time we lace up our hiking boots, whether we're adventuring in humid jungles, misty mountains, or dry-bones deserts. Engineered to keep us cooler in hot conditions, this updated shirt is now made with 100% natural materials-merino wool, known for its breathable and odor-resistant powers, and Tencel, renowned for unbelievable softness and natural cooling abilities-for comfort in any summer conditions.