Brunton Heatsync USB Power Vital Under Jacket, Black

The Heatsync Vital is an under-the-jacket heating system designed to keep your warm in the harshest conditions. The harness design is one-size-fits all, so you can keep one for every member of the family who needs to take the edge off an especially icy winter day. Ideal for cold weather conditions where movement or activity is low, or in dire situations where the user has become trapped or lost. Heatsync Vital rests against a shirt or base-layer and is powered by any Brunton 5V/2.1 amp USB power bank. Pre-heat function powers up at full heat for 5 minutes, then backs off to 80% power for added comfort and extended usage time.