I purchased this at a sporting goods store to wear for yoga. I've worn it about 10 times, so there's a little bit of pilling. The upper back is mesh, which is stylish. The sides have strings that can be adjusted to tighten. The material is smooth and stretchy, so I think it's perfect for exercising. Material: 89% Polyester 11% Polyurethane I plan to send it from the post office. Thank you.