The Kari Traa Sigrun LS is a slim fitting, long-sleeve training top for cool weather runs where comfort is key, but so is style. The front is made with DriRelease® Wool for a light boost of warmth with an always-dry feel. Stretch mesh with perforations in the back quickly vents out moisture from the body when active. Flatlock seams and 4-way stretch allow for the freedom to move freely, without chafing. The cuffs have thumbholes for extra coverage and an extra long cut with a wide elastic hem always stays in place.