The Amblers AS721C Hurdle is a metal-free safety trainer designed for protection and comfort. It features a 200 joules fiberglass composite toe cap and a non-metallic midsole for impact and penetration resistance. The trainer is lightweight with a fully non-metal construction, a low-sew TPU bonded breathable mesh upper, and a mesh collar for extra comfort. It includes a cushioned, removable PU footbed with arch support and an EVA midsole for enhanced comfort and shock absorption. The durable rubber outsole is heat resistant to 300 degrees Celsius, making these trainers suitable for demanding environments.