Description of Arcteryx Rho LT Zip Top The Acrteryx Rho LT Zip is an ideal trim-fitting technical foundation for maximized wicking performance. Lightweight fibers move moisture and a silver fabric treatment reacts with sweat to cut down on backcountry odors. The Rho LT Zip has gusseted underarms that provide extra mobility whether you are cross country skiing, snowshoeing or skating. Breathable and quick drying, the Rho LT is ideal for camping and travel. An Arcteryx synthetic foundation that enables warm, dry next-to-skin wicking performance. Features: Breathable and quick drying Form fitting Great warmth to weight ratio Half zip One laminated chest pocket with laminated zip (men's) No-lift gusseted underarms