How do puncture resistant labor protection shoes prevent the sole from being pierced?

The sole of anti puncture labor protection shoes is equipped with an anti puncture pad in the middle, which is usually made of high-density fiber fabric (such as Kevlar fiber) or metal sheet. When encountering sharp objects such as nails, glass shards, etc., these materials can prevent the sharp objects from penetrating the sole of the shoe and protect the feet from being stabbed. The standard stipulates that puncture resistant labor protection shoes should be able to withstand a certain amount of puncture force (such as 1100N) without being pierced. There are also many manufacturers of labor protection shoes now, such as Haoyatong Protective Equipment, Bard, and so on