mier women's athletic sleeveless summer tops spf upf 50 running tank shirt crewneck cool dry wicking outdoor walking muscle tee black m mier 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.