Keep seedlings safe from the weather and cozy with a convenient Jiffy T-Dome gro-dome. It is designed to foster growth and act as a mobile greenhouse for seedlings. This Jiffy dome measures 11 In. x 22 In. and fits over similarly sized trays. The unit is made of plastic material that provides a layer of protection while allowing sunlight in. Gardeners will love this accessory, which can be used year-round in some climates.