A GeoPot is our brand of fabric pot. We were not the first to create fabric pots, they actually have been used in the arbor industry for like 25-30 years as a way to sell fruit trees and other trees and ensure that the roots don't become girdled (root bound) before their final planting. They work great for all types of trees though!
Since they're fully breathable, they have great drainage, lots of air to the root zone, and also facilitate what we call "air root pruning." Basically, when the roots hit the edge of the pot, instead of wrapping back around and going in circles and becoming root bound the roots end up trying to grow through the fabric and getting exposed to air which in turn prunes the roots and then your plant starts putting out more feeder roots. Feeder roots are smaller, more fibrous, and are better at taking up nutrients and water to keep your plants very well fed and happy.