08.30.05
Airvantage vest uses your breath as insulation
As the title says, this jacket can be pumped up by breathing into a tube. Your breath will act as an insulator and keep you nice and toasty. If you get too warm, you can vent air out of the jacket to cool you off.
Airvantage vest uses your breath as insulation - Engadget - www.engadget.com