I found the problems in junior high school, but unfortunately I didn't have enough knowledge to solve them. Now I am determined to design a solution when I grow up. First of all, we have a thorough understanding of the physical phenomenon why we walk after rain and the toe of our shoes is always wet and soiled by muddy water. Please look at the figure below

1.2.3. Kicking water is actually a very simple physical phenomenon. The reason is that when people walk, the liquid on the sole of the foot is moved forward by inertia, and at the same time, it cannot be separated by the tension of the liquid and continues to move along the curved surface of the toe.

Now that we understand the causes and phenomena, and find the movement track of the liquid, it is convenient to design the solution. A circle of lace structure similar to canopy is added to the shoe tip. This design has relatively little change to the shoes, and can be made of silicone material similar to single-sided adhesive tape to facilitate the improvement of products on the market and more conducive to popularization.