Perfect for windy, cool days when a jacket is too much but you still want protection for your torso. Front panel fabric is moisture wicking, stretchable and windproof and the thoughtfully placed mesh back panel keeps you cool when the going gets tough. This must have piece is designed to resist the elements when you need it and then pack into an easy carry pocket when you don't. Barrier Stretch fabric provides optimal wind and water protection with 4 way stretch. Main Body: 100% polyester. Weight: 100 gm2. Side and Back Panels: 100% polyester. Weight: 32 gm2.