Tuck your feet into our bean bag and get them super comfy, then close the valve and you have your footprint proudly placed in our Happy Feet Footbag. Then pump the bulb which inflates the adjustment bladder and you will tighten up bag until you have the right amount of pressure to give you the control you like. Get to the bottom of the rapid, or pull into an eddy and hit the release valve, now you have excess room again and can lift your knees out easily to relax. This is how I define comfort and adjustability and this is the Happy Feet Footbag.