ARCTERYX–mens rho heavyweight zip neck-X000006266

The Rho Heavyweights – the warmest base layer tops – are made for  cold days and mixed output. On the move, the Polartec® Power Stretch®  Pro stretches for outstanding freedom of movement. During rest phases –  or when it gets really cold – the fleece’s soft brushed interior traps  heat to keep you warm. The fleece’s durable nylon outer has a smooth  face for comfort under layers, the tall collar extends warmth, and the  deep front zipper aids heat dump and makes on-and-off easier.