Abstract: A mouth cover includes a mouth cover body that covers at least the mouth and the nostrils of a wearer, and wearing portions that are connected to the mouth cover body and allow the wearer to wear the mouth cover body. The mouth cover body includes an opening in a downward direction from a position directly facing the mouth of the wearer.

Abstract: The present invention provides a shoe having a simpler structure compared to patent document JP-A 2010-162318, with reduced discomfort and enhanced repulsive force. According to an aspect of certain embodiments of the present invention, a shoe 10 comprising: a middle sole 14 having a foot contacting surface 40 and a ground contacting surface 42; an upper at least partially covering the foot contacting surface 40 of the middle sole 14; and an elastic structure 18 curving upwards towards the rear direction at least from the outer foot side of the ground contacting surface is provided. With such configuration, discomfort can be reduced and repulsive force can be enhanced.

Abstract: A shoe having a structure with excellent acceleration performance is provided. A shoe includes: a sole made of a soft material, which includes a ground contact surface and also includes a foot contact surface facing a side opposite to the ground contact surface; and an upper combined with the foot contact surface side of the sole. A thickness of the sole at a position corresponding to an MP joint of a wearer is different from a thickness of the sole at a position corresponding to the center of the heel such that an angle between the foot contact surface and the ground contact surface falls within the range of 8 to 16 degrees. Accordingly, a shoe having a structure that provides excellent feeling of acceleration is provided.

Abstract: A design element index input unit 10 inputs multiple design element indexes obtained by quantifying design in association with multiple portions constituting shoes. A learning unit 40 uses, as teacher data, pairs of multiple design element indexes and an impression index to learn correlations between multiple design element indexes and the impression index, and creates an impression estimation model. By means of a learned impression estimation model, an impression index estimation unit 60 estimates an impression index obtained by quantifying an impression of shoes, based on a set of multiple design element indexes that have been input. An output unit 70 outputs the estimated impression index.