In terms of structural design, the integrated vertical support strip formed by hot pressing on the inner and outer skin of the arch can not only enhance lateral support, but also combine with the texture of the arch on the sole to serve as a guide slot for our rope descent, enhancing the tracking effect when the rope slides over.

To improve the strength and fixation ability of the collar position, the collar position of the S4.5 shoe is covered with double-layer leather material, with double stitching and metal eyelets, which is not only durable, but also strong in temperament.

The collar of the shoe is in contact with the heel ligaments at the back, using a mountain shaped joint made of external leather and internal sponge, which is durable and does not bind the ligaments.

（3） Shoe tongue
The outer layer of the S4.5 tongue is made of nylon fabric, and the middle layer is a flexible sponge with a soft feel. The connection positions on both sides of the tongue are at the height of the second shoe hole, and the contact surface with the top of the heel is consistent. As long as the water level is below this point, the inside of the shoe will not enter water.

There is a small elastic cloth pocket at the top of the tongue of the shoe, which you can tie the shoelace and stuff it in to avoid accidental scratches that may cause it to loosen.

（4） Heel system
The heel leather is consistent with the toe, making it more wear-resistant. The heel system with a built-in hard lining board has a very clear fixation effect on our ankles, and it fits perfectly without feeling tight or causing heel displacement. It fits perfectly.

The shoe handle is made of 1-inch webbing, providing a clearer grip.

The shoe body and sole platform of S4.5 are sewn with front and rear foot stitching, making them more secure; Adhere to the arch position of the foot, even if deformed for a long time, it will not cause cracking at the thread hole position.

 Polyurethane insole
The color scheme of black on the outside and orange on the inside is very appealing to me. The horizontal slot in the middle reduces the resistance during bending, which is more in line with the bending shape of the foot's power

The honeycomb texture on both sides increases lateral friction and prevents displacement of the insole inside the shoe.