G-FIT Women's Airsweat Joggers Pants Cotton: 58%, polyester: 42% Light as air: 0.55lb and keep you feeling dry even when you perspire. UPF (Ultraviolet protection factor) over 45 Mesh lining reduces clinging when perspiring The size on the product tag is based on Japanese sizing system. e.g. M size on Amazon.com is Japanese L size.