Flyout Wool is our all-season superstar: it regulates your body temperature when it's warm outside, and keeps you toasty when the mercury dips. Since it's such a workhorse fabric, we wanted to design a silhouette that would go with everything, all the time. Enter the half-zip: It’s a classic fit that works well as an outer layer for running (or a mid-layer for chillier pursuits, like skiing). It washes well, holds up season after season, and features thumb holes and a Watch Window. Simply put? It's wool reimagined.