Checker car cover is the practical way to fight humidity-driven problems before they take hold. In the humid regions of the United States, from Florida and the Gulf Coast to the cool, damp Pacific Northwest, moisture lingers on vehicles after rain, overnight dew, and sudden temperature swings. Many owners have opened a door after a wet week to a cool cabin, a musty smell, and a faint film on glass and trim. That is the telltale sign that mold has started to colonize surfaces because moisture was trapped for too long. According to the U.S. Environmental Protection Agency, mold thrives anywhere humidity persists. The odor is unpleasant, and for sensitive people it can also irritate airways and eyes. Investing in a quality car cover that manages moisture is one of the simplest, most effective ways to keep your car dry and fresh.