Greenhouses are used in residential, commercial and agricultural applications. For customers living in colder climates, the right greenhouse covers can extend your growing season. Farmers with large greenhouses need the perfect sized cover in order to avoid having to cut down stock sized covers. In certain circumstances, the greenhouse covers available in stock sizes may not be large enough to cover your greenhouse. BTL offers clear woven greenhouse covers in 9-mil and 12-mil versions. The 9-mil version allows 87% of UV and light transmission, while the 12-mil allows 82%. With the fastest lead times in the industry, you’ll have your custom greenhouse covers in a flash.