What are some functions of the subcutaneous layer?

The skin is the largest organ in our body as it covers an area of about 20 square feet. It is made of three different layers, such as the epidermis, the dermis, and the hypodermis(subcutaneous layer). 

The epidermis is the outer layer and the dermis is the middle layer of the skin. The thickness of the subcutaneous layer is greater in the abdominal area(3 cm depth) and lesser in the eyelids(1 mm depth).