Still-feeling-cold-in-spite-of-thermo-liners-and-special-base-layers-Mounting-the-battery-powered-Hot-Vest-to-the-specially-prepared-position-in-the-liner-of-your-jacket-will-provide-heat-at-the-most-effective-places-The-rechargeable-battery-pack-can-be-placed-in-a-pocket-in-the-liner-One-fully-charged-battery-will-provide-up-to-3-to-8-hours-of-heat-only-in-Macna-jackets-with-the-Electric-heat-support-logo