150mm derby style lace-up and zip ankle work boot with padded collar and tongue. Industrial grade side zip for easy on and easy off. Durable polyurethane bump cap. 200J safety steel toe cap. Anti-static TPU outsole, heat resistant to 130 C. Steel Blue's Trisole Comfort Technology is specifically designed to cushion, cradle and support the entire foot from heel to toe. Strategically placed pads made from high-tech PORON are placed in the sole and under the foot's peak stress areas. Steel Blue stands behind the comfort of their work boots with their 30-Day 100% Comfort Guarantee. All Steel Blue boots are endorsed by the Australian Physiotherapy Association (APA). Complies with AS 2210.3, EN ISO 20345, ASTM F2413.