Our Drying Racks are made of breathable mesh material -- you'll never have to worry about rotting or fungus -- and with side walls that encompass each layer, there's no danger of losing any of your yield. Our Drying Racks are made of breathable mesh material -- you'll never have to worry about rotting or fungus -- and with side walls that encompass each layer, there's no danger of losing any of your yield. Available with or without clips, and in multiple sizes, these racks will fit any grow room situation. And when you're done using them, simply collapse them and store them in the included black carrying case.