Icebreaker Realfleece Sierra Hood

It's not easy to create high-loft insulation from merino wool. Unlike man-made fibers, which can stand up to vigorous brushing, wool fibers are more delicate. But that's what makes Icebreaker's Realfleece Sierra Hood so great. It's every bit as warm and soft as a traditional synthetic fleece jacket, but it's 100 percent sheep—and zero percent petroleum.

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