The Rapha Men’s Brevet Insulated Gilet does insulation to a “T”. This is what you need if you want to keep up with your training and bike despite the cold weather (How to choose the right bike for you). The gilet is light but it keeps you warm and the wind out. It packs up very well; you’ll barely feel like you have something on. It has reflective detailing throughout, stretch side panels, and a water-shedding durable water repellent coating for even more protection.