We’ve been skeptical about clothes that promise to do something other than cover our nude bodies since our Hypercolors were a bit of a letdown. That said, we’re willing to give the H2 Flow Jacket from Helly Hanson a chance. The lightweight jacket is made from 200g Polartec brushed fleece and a polyester outer shell and is designed with carefully placed holes to help regulate your body temperature. When you’re hot, it’s easy to vent the right areas to help cool off, and when you are cold, the mesh inner layer helps remove any moisture from your body and the outer shell protects against the elements. There’s a bit more that goes into it, so check the video on their site, but we’ll leave it at this: It’s science.