Perfect for adding a quick layer on a breezy course, this 1/2-zip top is made from smooth and lightweight knit. It's built to provide just enough warmth while still keeping a stretchy, movement-friendly fit. 1/2-zip design makes the top easy to take on and off. Smooth knit fabric has a lightweight, stretchy feel that doesn't interfere with your swing. Built-in back vent provides extra ventilation.