Bubble insulation helps to protect plants and reduces winter heating costs. The insulation is attached to the inside of the greenhouse frame using retaining brackets. The brackets are easily screwed into the greenhouse frame and they hold the insulation securely in place. This product is quick and easy to fit the first time and even quicker subsequently. The pack includes 245 square feet of bubble insulation and 90 retaining brackets. Each pack contains enough insulation and brackets to fully cover the walls and roof of a standard 8'x6' greenhouse.