The Ailsa Portable Walk-in Greenhouse helps to protect your plants from frost, cold weather, and pests. The Ailsa gives seeds, seedlings, and young plants the ability for a longer growing period in a protected environment. The design of Ailsa makes growing simple. Assembly is quick and easy. This Ailsa Portable Walk-in Greenhouse comes with a green powder-coated metal frame and dual-level metal wire shelving racks on both sides to allow for open airflow. The cover is made of heavy-duty reinforced PE material designed to last for years and slides over the frame. The opaque color also provides a much better growing environment for young plants that can easily get dried out with a clear PVC cover. The Opaque PE cover has a dual zipper door that easily rolls up and ties off at the top to allow fresh air to circulate in. When it gets cooler, simply untie the door which rolls down and zips it up and the greenhouse is sealed. Easy assembly with no tools required.