This February 2019 video says about itself:
See How Cracked Skin Helps Elephants Stay Cool | Decoder
Why do elephants have wrinkled skin? The intricate web of cracks and crevices that gives African elephants their distinctive look is, in fact, an essential adaptation. Their ability to stay cool in hot African temperatures is thanks to these “wrinkles”, which aren’t actually wrinkles at all, but millions of microscopic cracks in their epidermis.