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What is the Boreas Pull-on, exactly? Is it a long-sleeve shirt? Is it a soft-shell jacket? It's hard to pin it to one particular category, because its performance spans so many.
In basic terms, the Boreas is a lightweight stretch pullover made of Matrix SWS (Single Weave Stretch) fabric. The hood makes it look like a cold-weather piece in photos, but it's really at home providing sun protection in warmer climates, whether they are deserts or glaciers. That's what's so interesting about the Boreas - you could wear it on the beach in the summer just as easily as on a trek to base camp in the Himalayas.
Feature list from Rab:
In 1981, British mountaineer Robert “Rab” Carrington started making down jackets and sleeping bags in Sheffield, England. Inspired by the new style of lightweight alpine climbing which he helped pioneer, Rab made it his mission to make equipment that would withstand “the most extreme conditions in the world.”
Rab’s product line has expanded dramatically since then, but Rab’s commitment to functionality, durability, and value remains as strong as ever. At GearX.com, we are continually impressed by Rab’s superb knowledge of technical fabrics (they were the originators of Pertex) and attention to small yet crucial details like high-quality zippers. No matter which Rab product you choose, you can be sure that it will be a faithful companion in the mountains.