The material possesses high tensile strength, with the offset of summers we shut down our AC's but most of us do not cover them during the offseason, dust, water, debris and plenty of other elements can harm the ac unit by entering into the ac unit, these covers are, dustproof and made to withhold the extreme weather conditions, water can cause unnecessary waterlogging, dust can harm air filtration process, debris and other elements result into higher maintenance cost and messy servicing. They take care of us in summers so treat them well in winters, made in India.