While they appear to be your basic, nice-looking mitten on the outside, there’s some really cool technology working below the surface of Seirus’ HeatWave MsBehave Mitts to warm hands sans battery. We love Seirus’ relatable warmth story via its Dual Stage Heating System that first retains hand heat with the Thermal Reflective Layer—i.e. that shiny silver material that lines the entire mitten. In phase two, those little channels you see running through that material actually generate 4–5 more degrees in heat by wicking any moisture away from your hand. The mitten clip is also nice, and we think, necessary to ensure left and right come out of the ski bag together. 

Check out the FULL REVIEW for more about why we love this mitten.