The XT385 is designed to keep you motivated mile after mile. Our large 22" x 60" running surface and 3.5HP motor give you all the room and power you need for a comfortable workout. The top speed of 12mph and 15% elevation are sure to keep you challenged. The XT385 has the same options as the XT285 plus two user programs, up to 15% elevation capability, aluminum side rails, larger motor with wider belt, and frame uprights stability bar for a more solid feel. The XT385 connects to third party apps via Bluetooth FTMS and is Zwift App Compatible. This model is very appealing to someone that is a walker, at a transitional stage from walking to running, or a mid-level runner.