The Horseware Rambo Fly Rider is part of the Fly BusterTM family and uses a Vamoose Treated Material. The rug is treated with Permethrin, a man-made insect control treatment based on Pyrethrin, which is found naturally in certain types of Chrysanthemum flower. Vamoose Fly Sheets are EU Registered PCS No. 95869. Proven to control flies, ticks. fleas and mosquitoes. Vamoose is odourless and colourless .Will not rub off on your horse. Made from unique patented Rambo Protector fabric. Gives freedom of movement and extra protection. Protects sensitive area around dock and top of tail .UV protection and prevents bleeching of coat. Longer and shaped hood to keep your horse covered when moving. Elasticated closures at top & front of rug and contoured leg area. Can be used with or without hood. Easily opened and removed for safety.