This LeMieux Base Layer features a 1/4 zip design and provides UV50+ protection. It includes vented underarms for breathability. Made from Nylon for comfort and durability. Care instructions: Machine wash up to 30 degrees. Turn garment inside out before washing. Wash with similar colors. Use only non biological washing products. Do not bleach. Do not dry clean. Allow to air dry. Do not tumble dry or place on a direct heat source. Iron on low heat, avoiding logo areas.