The Lifetime Early Start Enclosure protects the seedlings in your raised garden bed from frost and other outoor elements. Constructed of clear plastic vinyl. The Enclosure can be used alone or in combination with the Lifetime Raised Garden Bed. It has a double door design with the exterior door made of clear plastic, and an interior door made of netting. The plastic door can be tied back during warm days and the net can tie back to allow for insect pollination. This product should not be used during the winter months to ensure maximum satisfaction. The Early Start Enclosure is best used during the early spring to protect the garden from the risk of frost.