All mammals, including humans, have body fat/insulation, but some have more than others (e.g., whales).
Just like all sea mammals, a layer of blubber (fat) keeps the animal warm. This serves as insulation, trapping the animal's body heat inside.
Myelin Sheath
Lined curtains offer the most heat insulation. They will typicall have an uncoated layer of fabric as the first layer and a seperated coated fabric attached as a second layer.
Why does flex have a thin layer of plastic on outside
it has currents
The silver layer of an insulation bottle does this to radiated heat
A 'cold roof' has the insulation layer beneath the roof deckA 'warm roof' has the insulation layer beneath the roof deck
Fat in the hypodermis provides mechanical cushioning as well as insulation for the body.
Blubber
GUYS THE ANSWER IS DINOSAUR FOOTPRINT NOT FRIKING MAMMALS
Some hibernate. Some have fur and / or blubber as insulation.
The air layer will improve the thermal insulation.