For those who run, HIIT workouts, travel or enjoy outdoor activities, MIER Women’s Sleeveless UPF 50+ Sun Protection Shirts are made from 100% polyester. Made of 4-way-stretch soft, lightweight and dry-fit fabric, this activewear tops provide long-lasting UV protection, make you feel cool and comfortable all day long. It has a great hand feel and breathable performance to keep you cool and dry, light enough to wear as a layering piece. It features dropped armholes for a relaxed fit, perfect for yoga, running, workout, fishing, hiking or outdoor activities. You'll be ready for warm, sunny days in this stylish tank with UPF 50+ and sweat-wicking power.