It's a jacket. It's a jersey. It's both! The castelli fly jack sey jacket jersey bridges that tricky gap between times when you're unsure whether you need a winter cycling jacket or a thermal cycling jersey.

When you want to ride fast in cooler conditions, the lightweight and aero castelli fly long sleeve jersey is the one. The heat you generate when riding hard is held onto by the lightweight fly t sl brushed back fabric while also dealing quickly with sweat.

When you want to ride fast in cooler conditions, the lightweight and aero castelli fly long sleeve jersey is the one. The heat you generate when riding hard is held onto by the lightweight fly t sl brushed back fabric while also dealing quickly with sweat.

When you want to ride fast in cooler conditions, the lightweight and aero castelli fly long sleeve jersey is the one. The heat you generate when riding hard is held onto by the lightweight fly t sl brushed back fabric while also dealing quickly with sweat.

Made to be impressively warm and incredibly lightweight, the castelli fly thermal jacket boost comfort when cycling in winter, but you'll barely know it's there, such is its lack of bulk.

Made to be impressively warm and incredibly lightweight, the castelli fly thermal jacket boost comfort when cycling in winter, but you'll barely know it's there, such is its lack of bulk.

Made to be impressively warm and incredibly lightweight, the castelli fly thermal jacket boost comfort when cycling in winter, but you'll barely know it's there, such is its lack of bulk.

Weighing in at a superlight 99 grams and utilising a gore tex infinium™ windstopper® inner lining, the castelli fly vest takes off the chill of cool winds while remaining highly breathable.