Quark shoes may very well be the 'lightest shoes on earth'. They also may be the most comfortable. Built from the lightest material available, each Quark shoe is lightweight, comfortable, and flexible. Slip on any Quark shoe, clog, sandal, or boot and immediately feel the sensation of walking on air. In fact, no other brand incorporates as many advanced features for lightness and comfort as Quark. Quark footwear is truly out of this world.