Your 40 hp four‑cylinder outboard works hard-give the cowling an everyday shield that's just as tough. This cover is sewn from Polysoft II, a soft‑lined, marine‑grade fabric that's 95 % waterproof to shrug off spray yet 5 % breathable so trapped moisture can escape instead of turning to mildew. UV‑stable pigments and official Mercury graphics keep the look factory‑fresh, while a 660‑lb tear rating means it won't rip if a hook or dock line snags it.. The Mercury Vented Splash Cover is made to use while running your outboard. Quick reasons you'll want it on before trailering or docking:. Blocks UV fade, bird droppings, salt corrosion, stray lures, tow‑rope rub, and parking‑lot bumps. Elastic hem pulls tight for a no‑flap fit even at highway speeds. Non‑abrasive polyester backing protects the paint-no scuffs or scratches. Vented panels prevent ballooning while maintaining airflow around the powerhead. Cleans up with a simple freshwater rinse-no soap needed. Cut specifically for Mercury 40