There must be a lot of friends who have had similar experience. After a couple of outdoor hiking shoes put it on for a while, then wear it and go uphill again. Halfway through the middle, the whole sole of the hiking shoe is peeled off. In fact, this process is very normal. To understand why we don't need to use it, we must first understand what the structure of a pair of outdoor hiking shoes is. What is the material?
The soles of hiking shoes are usually made of PU material. If they are not used for a long time, they will be prone to hydrolysis. Even if they are not peeled off, their wear resistance will be greatly reduced.
This is normal because the material is PU
Basically, a pair of hiking shoes will be made of leather or nylon shoes, sponge lining and PU soles. That's right, 99% of the problems are damage to PU soles. The full name of the PU material is (Polyurethanes, polyurethane). This material has the advantages of light weight, high resilience, shock-absorbing, anti-sliding and anti-slip, etc. The surface is also bright. Therefore, many high-quality hiking soles use this material as a midsole.
The PU also has a characteristic that it can be naturally decomposed after being disposed of (that is, commonly known as oxidation or hydrolysis), so it does not cause a burden on the recycling process and can reduce the impact on the environment. The property that PU is hydrolyzed is also called by many people as eco-friendly glue. The oxidation of the PU material is due to prolonged standing, resulting in the phenomenon of corrosion and loosening of the PU material, also known as hydrolysis. The particle structure of PU polyurethane itself, after being exposed to air for a long time, will gradually produce an increasingly larger particle gap (this is a natural process).
However, if we often give appropriate pressure, we can slow down the disintegration, so as long as we often wear mountaineering, we can maintain the durability of shoes. Because the water molecules and moisture in the PU pores are squeezed out and become dense, the rate of hydrolysis can be slowed down. This is the same reason as the body is inactive for a long time. Therefore, if the soles of the hiking shoes in your shoe cabinet peel off, it is obvious that you have not been climbing for some time.
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