(or related R1 zip fleeces), which are highly popular "solid" technical layers for outdoor activities. Key Performance Specs

The R1 series is a staple in the outdoor industry, known for balancing warmth and breathability during "high-output" activities like climbing or skiing. Patagonia R1 Air Sustainability Report - Better Trail

While "r1.zip" might look like a computer file name, it almost certainly refers to the Patagonia R1 Air Full-Zip Hoody Go to product viewer dialog for this item.