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The lightest three-layer stretch fabric, GORE-TEX INFINIUM WINDSTOPPER, was used for the Castelli Go jacket, making this jacket suitable for mild conditions. Its elasticity gives the jacket an excellent fit. Add a Flanders Warm base layer and a thermal shirt to bring comfort even in sub-zero temperatures. The qualities of the fabric are only the starting point. The fit is both snug but not overly tight. This gives the jacket a perfect fit, complemented by details such as the seamless finish on the hem and the colored chest pocket with zip. The hidden inner cuffs offer a nice touch of comfort and you will appreciate how they prevent the wind from entering your wrists. On the back there are three pockets with a large reflective strip that extends across the bottom of the pockets to make you highly visible at night.