These cold frames were easy to assemble and fit perfectly in the raised bed planters I bought on Wayfair. They held up well and protected my plants through our desert late winterearly spring. With summer it will be time to take off the plastic and add shade cloth over the frames. In the meantime, the covers unzip and roll up with sturdy ties to keep them open. There are zippered openings on each end also for easy access and ventilation.