Mizuno Running Women's Breath Thermo Stretch 1/2 Zip Top 91% Polyester/9% Polyacrylate, 150 gm Imported Front Zip with Zipper guard in addition to Superior moisture absorbtion fabric Designed with Mizuno's "Virtual Body" technology" Breath Thermo changes body moisture to heat for overall warmth 2-way stretch Breath Thermo of optimal fit 4 Needle flat lock construction