Why does a bulky body tend to conserve more heat than a slender one?

Name: Why does a bulky body tend to conserve more heat than a slender one?
Brand: Quizplus
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Question

Quizplus · Accepted Answer

A bulky body has more volume (mass) and less surface area (skin/cells) in proportion to its mass compared to a slender body. As heat loss occurs through the surface of the body, a smaller surface area means less heat loss to the environment, resulting in more heat being conserved in a bulkier body.

Why Does a Bulky Body Tend to Conserve More Heat