The altura merino short sleeve womens base layer has been designed to regulate your body temperature and be comfortable enough to be worn all day long the base layer naturally wicks away moisture to help keep you dry and its flatlock stiched seams offer extra comfort it has been made from 100 merino wool a material known for its insulating and high wicking properties the short sleeve base layer has been designed to be worn against the skin and it39s got such a close fit you can ea