The Genesis 4 Tier portable rolling greenhouse helps to protect your plants from frost, cold weather & pests. The Genesis gives seeds, seedlings, & young plants The ability for a longer growing period in a protected environment. The Design Of The Genesis is simple to grow both indoors or out. The caster wheels allow for easy movement from room to room or from shade to sun. The size is ideal as well for urban gardeners allowing for plants to thrive on a patio or in your family room. This Genesis 4 Tier portable rolling greenhouse comes with a Green powder coated metal frame & metal wire shelving racks to allow for open air flow. The cover is made of heavy duty reinforced PE material designed to last for years & 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 & ties off at the top to allow fresh air to circulate in. When it gets cooler, simply untie the door which rolls down & zip It up & the greenhouse is sealed. Easy assembly with no tools required.