Boat covers should be properly secured to your boat or trailer. A loose cover or stone guard will flap in the wind and be vulnerable to tearing. this is particularly true for covers on a boat being towed at speed on the motorway. If your boat is stored outside, try to avoid leaves or other organic material from collecting on the cover. Rotten vegetation can cause staining and damage the fabric. Always allow boat covers to dry properly before folding away for storage. A damp cover will rot and also stink if left long enough!