A steel midsole in the shoe protects from perforation or the penetration of sharp objects through the outsole. KPR offers two main mid-sole options – steel and textile. Read the below to decide which will work best for your needs. Steel Sole Plate – Anti-puncture Steel soleplate offers protection against sharp objects that could penetrate the outsole of the shoe. Developed to withstand a force of 1100N (Meets EN 20345). Textile Board – Anti-puncture textile board offers protection against sharp objects that could penetrate the outsole of the shoe. Lightweight, flexible, and airport-friendly. Developed to withstand a force of 1100N (Meets EN 20345).