This clever cold frame provides dual protection! Use the polycarbonate top panel to protect plants from chilly temperatures and wind, so you can plants out weeks earlier and to harden off transplants. Once the weather warms up, slide out the polycarbonate top panel, leaving the screen to foil most insects, slugs and wildlife. The screen allows good air circulation and protects plants from hard rain and hail. And you can water right through the screen. In fall, slide the polycarbonate top panel back in to protect plants from early frosts, extending the growing season. The 4mm thick, twin-wall polycarbonate includes a 5-year guarantee against UV damage. Includes ground anchors.