It all starts with a warm and wicking foundation. The waffle pattern on this Merino wool layer traps air against the skin to increase insulation, while also allowing heat to escape as the effort increases. Merino is an ideal insulating material for a base layer thanks to its natural versatility: It not only insulates, but also regulates temperature and wicks sweat. Soft and not at all scratchy. Size XS Measurements when laid flat (approximate) Bust: 13" Length: 21.5" Gently used condition. One pulled thread at the shoulder (circled) 28410-1118-24