US Patent 11622598 Easy-entry shoe with a spring-flexible rear

A shoe including a sole and a shoe upper, the shoe upper including a shoe opening for entering the shoe, the shoe opening defined by a rear part, a medial part, a lateral part, and a front part, the rear part including a top portion, reinforced by a firm material, an optional bottom portion reinforced by a firm material, a center portion, located between the top portion and the bottom portion, the center portion made of a flexible material, and a spring element. The top part of the spring element being attached to the top portion of the rear part, and the bottom part of the spring element being attached to either the bottom portion of the rear part, or to the sole.