You don’t need to check the weather forecast before your run with the On Climate Shirt. This lightweight shirt adapts to your body temperature by insulating your skin when it is chilly out and airing it out when it heats up so you will always be at the perfect temperature. On engineered a special waffle fabric that is knitted with a 3D effect. It absorbs sweat faster than most running shirts and keeps you fresh and comfortable. On Running designed this shirt with all of the details you need so you can wear it during fast speedwork on the track or on an all-day hiking adventure. It has a four-way stretch fabric, allowing you to move freely. Not only does it have the essential thumb holes that make a long sleeve running shirt great, but it also has a watch hole so you do not have to roll up your sleeves to check on your mileage. This long sleeve gives you another reason to run in the cold. Perfect for a day exploring outside or a tempo run, the On Climate Shirt will be your new favorite mid-layer top. Check out our On Spring Apparel review.