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.
(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
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