With a tunneled design that"s perfect for experienced growers, the GrowIt Organic Growers Pro RoundTop Greenhouse - Round Style features a strong and durable 1.375-inch steel frame with a DuPont powder-coat finish for durability. ShelterLock steel stabilizers on the frame add extra strength. Its water-resistant polyethylene open scrim cover blocks out harmful UVA and UVB rays to help protect your plants. Easy Slide™ cross rails help to ensure that your cover is fit snugly on the frame. Roll-up side panels and zippered half-moon vents helps to control air flow. This greenhouse is great for extending the growing season, starting seeds, and growing your favorite fruits, vegetables, plants, and flowers. Additional Features * Easy Slide cross rails ensure a snug cover fit * Features a tunnel design for experience growers * Roll-up side panels help control airflow * Zippered half-moon vents help with airflow * Extends the growing season About ShelterLogic LLC ShelterLogic LLC specializes in manufacturing and distributing a full line of multi-purpose, all-weather shelters and accessories for consumer and commercial use. ShelterLogic offers the most diverse shelter product line and is the worldwide leader in innovative shelter design and manufacturing. The company makes shelters for all kinds of weather and custom solutions for every customer"s need - from a full line of canopies, garages, sheds, and storage shelters to popular ports, greenhouses, equine, and engineered structures. More than 2 million ShelterLogic all-weather shelters provide protection and stand between valuable possessions and the destructive forces of nature"s elements. * Strong and durable 1.375-inch steel frame * Frame features a DuPont powder-coat finish * ShelterLock steel stabilizers for added durability * Water-resistant polyethylene open scrim cover * Cover blocks harmful UVA and UVB rays * Available in your choice of size