Alpha Pro Men´s is a light weight vest with warmI-Warm panels in chest and back. By using the app in your smartphone, the temperature is set individually on each of the three heat panels. Comes with a built-in thermostat function. Power Bank, 10 000 mAh is included. Please choose a tight size for best heat function.\n\nOuter: 100 % polyester Swedteam Men's Alpha Light Pro Vest Swedteam Green | Buy Swedteam Men's Alpha Light Pro Vest Swedteam Green here | Outnorth