A unitary biodegradable, absorbent flexible back and body strap for selectively applying a protective substance and a skin-protective agent to a user's body, the strap having an elongated thin parallelepiped midportion, a biconcave first gripping end, and an opposite biconcave second gripping end, each end having a tip narrower in width than the midportion. The midportion is impregnated with a protective substance, which may be a body lotion, sunscreen, insect repellant, or a combination of sunscreen and insect repellant. At least one protective agent layer may be disposed on a midportion top side, which contains a skin-protective agent. The user alternatingly pulls the first gripping end and the second end from side to side across the desired body portion to selectively apply the protective substance and the skin-protective agent discards the strap whereinafter the strap biodegrades.