Under Armour Women's ColdGear Reactor Long Sleeve,Black /Reflective, X-Small

ColdGear Reactor is intelligent insulation that adapts to your activity level for the right breathability & warmth for what you're doing. Ultra-light fabric has a unique hex-shaped pattern that traps some warmth but still breathes as you run. Raglan sleeves unlock mobility for serious range of motion. Ergonomic flatlock seams deliver a comfortable, chafe-free fit. Shaped drop-tail hem delivers enhanced coverage without added weight or bulk. Super-light, free-cut cuff with thumbhole traps heat .