Made from recycled polyester yarns, the Inov-8 Women's Train Elite Mid Half Zip Running Top is a lightweight and warm mid-layer ready to take on a variety of activities in colder conditions. Made with brushed fabric that not only retains warmth but feels great against your skin, while 4-way stretch fabric alongside flatlock seems allows full freedom of movement with minimal chafing and irritation. The half-zip construction allows you to cool down easily and an auto-locking YKK zip locks the zip in place so it doesn't slide down on its own accord.