Previously the Rho AR Zip Neck, the Rho Heavyweight Zip Neck – Arc’teryx warmest base layer top – are made for cold days and mixed output. During rest phases – or when it gets really cold – the fleece traps heat to keep you warm. 

Features:

• Rho series: Thermally efficient base layer with excellent moisture management properties and stretch comfort
• Polartec® Power Stretch® Pro combines a highly durable nylon outer with a soft brushed polyester interior:
• Next-to-skin moisture management - wicks moisture away from the skin to maximise dryness and warmth
• Thermal efficiency with a great warmth-to-weight ratio
• Stretchy fabric provides outstanding freedom of movement
• Smooth outer surface for easy layering
• Articulated patterning for unrestricted mobility
• Tall collar for added warmth
• Deep front zipper for easy on and off, rapid ventilation
• Chest pocket with zip
• Trim fit: keeps warmth close to the body and makes it an ideal layering piece
• Weight: 285 g
• Sustainability: contains materials that meet the bluesign® criteria
• Materials: Polartec® Power Stretch® Pro - 53% Polyester, 38% Nylon, 9% Elastane