Fits like a jersey protects like a jacket the castelli trasparente 3 wind jersey is the same piece the team cannondale garmin team is using for winter training and youll be reaching for it again and again too castelli gave it full front wind protection but cut it close to the body like a jersey and gave it a full thermal breathable back so you dont overheat it falls in that in between land between a jersey and a jacket it keeps you nearly as warm as a jacket yet doesnt let you overheat