Our versatile baselayer design is in a midweight fabric. The updated 260 Tech Long Sleeve Crewe is a go-to foundation for cold-weather layering, whether you're scoring a powder day at the resort or enjoying a quiet hike through the woods. Made from 100% merino wool jersey fabric, the Tech LS Crewe insulates next-to-skin, breathes to regulate temperature and resists odors on active days or long stints away from home. Gusseted underarms, forward side seams and offset shoulder seams improve the range of motion and prevent chafing when you're moving fast or wearing a pack.