88% Polyester/ 12% Elastane. Activity mapped on sides for breathability where you need it. Balaclava hood with head-hugging elastic shirring is a great scarf stand-in to keep your face warm on the way to work. Envelope sleeve pocket with media port. Thumbholes hide your hands and keep sleeves in place. Flattering lines follow a woman's form. Reflective logo alerts others in low light. No side seam eliminates chafing.