Abstract: A footwear has a heel, a protruding portion with a core protruding above a topline of the heel, and the protruding portion has first and second mountain portions on both sides and a valley portion between the first mountain portion and the second mountain portion, respectively. The footwear has a first guiding portion formed on the inside of the footwear of the first mountain to guide a heel of the foot into the footwear, and a second guiding portion formed on the inside of the footwear of the second mountain to guide the heel of the foot into the footwear.

Abstract: An inner sole for an insole has a body made of flexible material and adapted to be laid on an insole of a shoe. Liquid containing spaces are formed in the body of the inner sole for sealingly and flowably containing liquid. Dam portions divide the liquid containing spaces into a toe region, a heel region and a middle region between the two. Orifices communicate the liquid between mutually adjacent regions. The orifice formed by the dam portions that divides the liquid containing spaces into the heel region and the middle region opens toward one side edge portion to cause an eddy of liquid, flowing from the heel region into the middle region, that substantially fills the whole middle region.