The waist-high additional bag gives your sleeping bag an extra portion of insulation. In addition, the built-in electric heating element with a standard power bank provides even more warmth.
"Muggle warm!" - An enthusiastic user
The Feater - The Feet Heater is available in several versions:
Feater - The Feet Heater
Feater - The Feet Heater Deluxe
Feater - The Feet Heater DownWool