When you step out into the garage to pack the car on the morning of your 'cross race, you realize you can see your breath preceding you in white clouds. The grass is a little frosty in the yard, which means it's going to be even chillier under tree cover when you get to the race. Step away from the newspaper you're thinking about bringing with you for a little extra insulation and reach for Castelli's 10m Lung Warmer Top instead to avoid starting your race off with a burning, tight chest. Made with Gore's Windstopper 3 layer fabric, the Lung Warmer is thin enough to fit between your base layer and your race suit. Designed with a high neck, it'll act as a barrier against harsh wind to help your air passages stay warm so it's easier to breathe in temperatures below 41 degrees Fahrenheit. Castelli constructed the Lung Warmer to extend only to the upper part of your torso where you catch wind, and the streamlined size allows you to fold it up and stick it in a pocket mid ride. Wear it while you're taking warm up laps or even through the start of your race or ride and take it off in seconds with the tear away style closure at the top.