RediRoot Aeration Liners are constructed of high quality non woven fabric. This fabric provides great support, while allowing air to travel into the root system. The RediRoot Liners have sturdy handles, making lifting and transporting a breeze. Using the RediRoot Liners, with the RediRoot Frames, gives you the added oxygen to the root zone, while maintaining proper support for your plant. This unique design allows you to move your plants without the damage that occurs with standard grow bags.