1. Epidermis: The outermost layer composed of dead and living skin cells.
2. Dermis: A thicker, underlying layer made of connective tissue, blood vessels, and nerve endings.
3. Hypodermis: Insulating layer known as blubber, rich in fat for energy storage and warmth.
4. Stratum Corneum: Outermost layer of the epidermis, consisting of tightly packed, flattened dead cells.
5. Epidermal-Dermal Junction: Where the epidermis and dermis layers meet.
6. Hair Follicles: Structures that produce and house hairs, contributing to insulation.
The thickness of these layers varies depending on the seal species and its environment.