Radiation heatreflecting technology requires an outer shell that is both windproof and breathable. In 2006, Castelli and W.L. Gore created an innovation partnership to harness Gore's incredible technical knowhow and Castelli's insights into cyclists' needs. This partnership provides the external shell that makes Radiation possible. The Windstopper shell that we use for our Radiation jackets is one of the lightest, stretchiest, and mostbreathable 3layer fabrics that Gore has ever produced. It
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