Protective footwear is an important piece of personal protective equipment, primarily used to protect the feet from injuries caused by falling objects, sharp objects, chemicals, etc. Common types of protective footwear include impact-resistant shoes (steel-toed shoes), puncture-resistant shoes, anti-static shoes, and acid and alkali-resistant shoes, all of which must comply with the national standard GB21148. The soles are mostly made of polyurethane or rubber, which have anti-slip and wear-resistant properties.