Castelli's Pro Thermal Mid Vest provides the additional warmth needed for brisk days without a windproof layer, so you'll stay comfortable and dry through high intensity work without overheating. Pro riders have long kept a similar vest in their arsenal for cold weather training, and Castelli brings the professional-level attention to detail and fit to this vest. With three rear pockets to store fuel or additional layers for the cool-down, the Pro Thermal Mid will quickly become your go-to for staying off the turbo and getting those training sessions done outside.