Gardeners can see all the benefits of growing with Smart Pots even if they grow in trays, thanks to Smart Pot Tray Liners. The soft material allows more air to reach the growing medium and roots, improving drainage and keeping root systems from overheating on hot days. Plants roots also benefit from their natural tendency to grow into soft surfaces like Smart Pot Tray Liners, becoming thick and healthy instead of circling the inside of the pot and becoming rootbound.