Built for the deepest cold, the Arc'teryx Rho SV Women's Zip Neck is the warmest base layer top in the Rho line. A heavier hollow-core fleece delivers an exceptional warmth-to-weight ratio, breathes well, and resists shedding, so it keeps you warm without weighing you down. It is the foundation layer for serious winter days when the temperature really drops.

Why we like it:

A low-profile laminated chest pocket sized for a phone is a genuinely useful surprise on a base layer, keeping your essentials warm and close. The deep front zip makes temperature control and layering effortless.

Features and Functions:

The Rho SV is built from 210 gram hollow-core fleece with an exceptional warmth-to-weight ratio, designed to minimize shedding and made with recycled content. A deep front zipper provides ventilation and easy on-off, a tall collar adds warmth, and a low-profile laminated chest pocket fits small essentials and most phones. Patterning and seaming minimize chafing while stretch aids mobility.

Fit and Sizing:

A fitted cut with articulated patterning and a bit of stretch moves with you and layers easily under a shell. True to size, with a close, performance-oriented fit.

Bottom Line:

For severe cold and high-output winter days, the Rho SV Zip Neck is best at maximum base-layer warmth that still breathes. The pick when standard baselayers leave you cold.