What is the version of the following sentence with correct punctuation?

Memory foam has always been a godsend to sufferers of bad backs arthritis allergies and sensitive skin because as it wraps itself about your body it increases the surface area by which your body is supported and increased surface area equals less pressure
Memory foam has always been a godsend to sufferers of bad backs, arthritis, allergies and sensitive skin, because as it wraps itself about your body it increases the surface area by which your body is supported and increased surface area equals less pressure.