Safety boot ascent s3 src size 42. standard: en iso 20345: 2022, upper: waterproof leather, exterior lining: breathable fabric. interior lining: trai-tex 100% polyester, three-dimensional, breathable, absorbent and deabsorbent, anti-abrasion. insole: evanit with special mix of eva and nitrile, great comfort and variable thickness (12mm - 8mm - 3.8mm). thermoformed, anatomic, perforated and lined with very breathable fabric. antistatic thanks to a special treatment of the surface and to seams made with conductive threads. sole: double density polyurethane. toe cap: fiberglass cap, non-metallic in fiberglass resistant to 200 j. anti-perforation insole: non-metallic apt plate - zero perforation. last: 10.5 mondopoint (sizes 38-39) - 11 mondopoint (sizes 40-48). performance and technical