Our R & D team has developed epochal and economical products SHOER, which is loaded 4 wheels at limited out-sole world firstly. When turned to the right, the control knob, located on the rear of wheel cover, automatically folds the wheels back from a sole. User can use SHOER as normal sports shoes in limited locations(unpaved road, stairways and steep slopes). On the contrary, the control knob folds the wheels over from the sole and the user can enjoy in line skating at flat road.