Final answer:
The layer of skin without fine hairs is called glabrous skin, mostly found on fingertips and lips. It is thicker (4 to 5 mm) than hairy skin and contains no hair follicles, unlike the skin on other parts of the body.
Step-by-step explanation:
The layer of skin that is absent of fine hairs is known as glabrous skin. This type of skin is found on the human fingertips and lips. Unlike hairy skin, which is typically around 2 to 3 mm thick, glabrous skin is thicker, measuring about 4 to 5 mm. It also contains more densely packed touch receptors, making it more sensitive.
The thick skin of the palms and soles is another example of skin that does not contain hair follicles. Instead, these areas have a different epidermal layer structure, including a clear layer known as the stratum lucidum, which lies between the stratum granulosum and the stratum corneum. The absence of hair in these areas is also the reason for the lack of sebaceous glands, since they are typically associated with hair follicles.