The Castelli Flight Jacket Air specialises in maintaining your core temperature without letting you overheat, whether you're riding hard and fast or cycling in the cool of the morning. It does this by combining thin yet toasty padding at the chest, sleeves and upper back with a water-repelling outer that blocks the worst of the wind without preventing the evacuation of sweat. This combination of Nano Flex Light fabric and Polartec Alpha insulation makes the jacket ideal for days when a jersey won't cut it, but a weatherproof jacket would be overkill. It's moderately protective yet airy, fitted without being restrictive, and adds a veneer of warmth without discouraging you from riding all-out. Sleeves that can be stretched over or tucked into the wrists of your gloves, a short cut to prevent bunching, three generous pockets and reflective detailing at the back all boost the versatility of this lightest and fastest of all Castelli's jackets, tailormade for hinge season use. Features An extremely light, breathable jacket that lends a touch of warmth to your ride. Nano Flex Light fabric lets in enough air for you to stay dry, without getting cold. Outer has a water-repellent finish. Polartec Alpha insulation adds nearly weightless insulation in key areas. Fits close to the body, promoting aerodynamics and warmth. Stretch sleeve endings tuck into or pull over gloves. 3 rear pockets for storage. Reflective detailing on back. Weighs 249g (large size). For use at temperatures from 6-15 ̊C, 43-59 ̊F.