The Castelli Aria Shell Jacket is an ultralight, windproof jacket. Excellent protection from harsh winds whilst remaining incredibly light and aerodynamic. The striped mesh along the back, sleeves and sides of this jacket avoid any flapping in the wind. The Castelli Aria Shell Jacket packs away conveniently into its own pocket when not in use.  Castelli Aria Shell Jacket Features Ultralight windproof jacket Striped mesh back, sleeves and sides that avoid flapping in the wind Packs small into its own pocket Convenient rear pocket Ykk Vislon zipper Reflective detailing Temperature comfort range 10° - 18°c Weight: 99g (Large)