With flatlock seams and lightweight fabric to keep you warm without restricting movement. HH LIFA® Light is a performance thermal underwear, delivering light weight insualtion and comfort for everyday use and high performance activities. HH LIFA® light constructed with 100% Lifa fiber is quick-dry, very breathable and super lightweight. Continually perfected over the last 40 years, Lifa® Stay Warm technology is the unique ingredient of all Helly Hansen base layers. Features: Light weight insulation Flat lock seams Fitted 125g/m2