PROBLEM TO BE SOLVED: To unitedly contain a plurality of air bags and air supply/exhaust device for supplying/exhausting air through air hoses to the air bags in an interior section of a mat main body, to make it convenient to move or carry a device to place it at a limited space, ...
PROBLEM TO BE SOLVED: To keep the sole of a shoe from being soiled even if stepping on a range of a soiled replacement mat and to keep the surface of the replacement mat from being soiled even if stepping on the range of the replacement mat with the soiled sole of the shoe in a ...