heatpocket
nounUK /ˈhiːtˌpɒkɪt/
US /ˈhiːtˌpɑːkɪt/
A small warm spot inside something.
The kitten curled up in a heatpocket under the blanket.
OTHER MEANINGS
2. A pocket of hot air or gas trapped inside a material or the ground.
The geologist found a heatpocket beneath the rocks.
3. A small insulated area in clothing that keeps your hands warm.
My winter coat has a heatpocket for each hand.
4. A warm, sheltered place where animals rest.
The birds found a heatpocket near the sunny wall.