From the appearance of sports shoes, the bonding state around the outsole should be closely adhered without any gaps, and the sole should be flat. Whether it is a low heel or a high heel, the first thing to consider is whether the fit with the shoe is natural and level. For women's shoes with half high heels or above, the following two points are more important: first, the heel should be firmly attached to the inner sole. The front, back, left, and right should not sway; The second is that the palm should not be smaller than the sole of the heel.

The line characteristics of sports shoes are: complex lines and diverse forms. There are single line, double line, false line, open line, dotted line, contour line, edge line, seam line, decorative line, etc., which can be used on a pair of shoes at the same time, not limited to one type. Mainly consisting of arcs, with less proportion of straight lines.