TINYUNICORN Women's Printed Padded Workout Wireless Yoga Sports Bra Medium support 90%Polyester/10%Spandex. Please note it, Our Sizes are Asia Sizes, Tag S=US XS;Tag M=US S;Tag L=US M; Good Stretch Criss-cross back straps let you twist with ease.Super-smooth, 90%nylon delivers superior next-to-skin feel and lasting comfort Breathable sports bra featuring strap stabilizers and compressive fit for support Moisture management technology and knit in ventilating mesh help keep you cool and dry This bra is perfect for medium impact activities like jogging, biking, and fitness classes.