One of the biggest problems in space is head aches and brittle bone from anti gravity in space. To prevent this I made the Anti Fatigue Sole, which is like a shoe sole, you put your foot on top of the sole so that the big hoop is over your foot. Next, you place your foot in the carving of the same shape of the sole. You wrap a tether around your foot and the astronauts will no longer be floating. Knowing you have tethers, I did not bother designing them. The square below the sole is titanium. The sole itself is titanium as well, but the big hoop on top is adjustable nylon.