From Lululemon I think this is a different version of Keep the Heat Thermal Long Sleeve Worn a couple times Keep warm during intense cold-weather activities. This high-performance layer is sweat-wicking on the inside and insulating on the outside. ✧ Bundle to save! ✧ Size: 4 (No size tag, I think size 4?) ✧ Color: Black ✧ Wrinkled from storage ✧ I do my best to remove lint/pet hair before shipping