Horseware fly buster with vamoose the rambo fly buster is a great option for horse owners looking to provide the ultimate in fly armour for their horse during the summer its treated with vamoose a permethrim based insect control technology and repels flies without needing to add any other chemicals plus it will stay effective for up to 25 washes its made from a unique polyesterpolypropylene mesh fabric thats durable enough to prevent nicks rips or tears yet is ultra breathable a