From the manufacturer: Achieve peak performance in our Seamless Ruched Long Sleeve Top, designed to elevate your workout experience. With features like thumbholes and internal hem-grippers, you'll enjoy a secure and stay-put fit during any activity. The 4-way stretch ensures freedom of movement, while the side ruching adds a touch of style to your fitness routine. Conquer your fitness goals in style and comfort with our Seamless Ruched Long Sleeve Top. DETAILS SIZE & FIT CARE Materials: 96% nylon 4% spandex Quick-drying, moisture-wicking, 4-way stretch Internal hem-grippers provide a stay-put fit Chafe-free seamless construction for comfort Thumbholes Designed for medium to high impact activities at the gym, studio or outdoors This material is certified by Standard 100 OEKO-TEX (Certificate Number: BEGO 075699) which ensures that no hazardous substances are present Produced in BSCI (Business Social Compliance Initiative) certified factories which aims to improve working conditions throughout the supply chain Made with care in Zhejiang, China