Performa Ride Chill Base Layer Winter Riding TopAn equestrian base layer top that will keep you warm and covered through any type of horse riding adventure in cold weather. Made from our signature winter performance fabric, the Chill base layer is the perfect long sleeve riding shirt to wear underneath a vest or jacket. In our new slim fit, the Chill base layer fits more closely to the waist, and is the perfect length for tucking in. On sizing: Adults XS 6 8, Small 8 10, Medium 10 12, Large 12 14,