Stretch arm warmers offer a lightweight option for added warmth when needed. The Swift Arm Warmers can be quickly added to a short sleeve top when reaching a summit and stashed away when in warmer temperatures. Swift Arm Warmers feature a thumbloop providing extra protection for the knuckles and back of hand. Stretch Polyamide (18% Lycra) yarn fabric is high-wicking though not cool-to-feel with 4-way stretch and good durability.