Stretchy for enhanced movement, wind-blocking thanks to WindWall technology and, as the name suggests, incredibly warm, too - the Winter Warm Pro Full-Zip Jacket is built for pre-dawn and sundown runs on the trails. It's stuffed with light and lofty Heatseeker Eco over key areas to lock in body heat - even in damp conditions. It stows into its own pocket, there are reflective details and it has hand warmer pockets for extra comfort. Plus, it's made from recycled polyester, helping to give discarded plastic a new purpose.