What is the toughest part of the human skin?

The toughest part of human skin is the stratum corneum, the outermost layer of the epidermis. This layer consists of dead skin cells that are tightly packed and surrounded by lipids, providing a protective barrier against environmental damage, pathogens, and water loss. Its toughness is essential for maintaining skin integrity and overall health. Additionally, the thickness of the stratum corneum can vary in different body areas, with areas like the palms and soles being particularly thick to withstand friction and pressure.