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The foreskin (also known as the prepuce) is the double-layered fold of smooth muscle tissue, blood vessels, neurons, skin, and [[Preputial mucosa| mucous membrane]] part of the penis that covers and protects the [[glans penis]] and the urinary meatus.<ref name="cold-taylor1999"/> The adult foreskin measures about 3 inches by 5 inches or [[The Foreskin: 15 Square Inches of Erogenous Tissue| 15 square inches]].<ref name="taylor1996">{{TaylorJR LockwoodAP TaylorAJ 1996}}</ref> The two foreskin layers provide a skin reserve. When the penis becomes erect, the foreskin may wholly or partially unfold to provide the necessary skin to allow for expansion of the penis during erection.