Are clouds solids, liquids, or gases? Asics would like you to think of something that’s in between all three states of matter. Like a gel. The best Asics Gel trainer for neutral runners may be the Nimbus 20, the premium model that has been winning over runners with its generous padding and supreme comfort for two decades. With its soft heel, the Nimbus may also be the best Asics for plantar fasciitis.