The new Castelli Alpha Jacket is windproof and water resistant thanks to GORE Windstopper’s 150 material. But the real innovation on this jacket is the detached insulating layer which stays close to your body when you unzip the jacket so your core doesn’t get blasted with cold air.
With the Alpha, Castelli detached the insulation layer from the windproof layer so that you can open the windproof layer to let air in to ventilate and help evaporate moisture. Riding these pieces shows how effective it is at regulating temperature and comfort while helping to keep you drier. The second focus area is all the openings. At the waist we have a new fabric and construction that lays completely flat, is streamlined for aerodynamics, yet when you drop into the riding position it follows your body without binding or billowing. A new flat raw-edge construction at the wrist interfaces perfectly with your gloves to keep drafts out and to improve comfort. At the collar, there’s a new articulated construction that follows the bends in your neck whether you’re standing or riding in the lowest aero position.
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