The Rock Fall Fly lightweight breathable safety trainers are 100% non-metallic. Developed with innovative comfort materials including nylon and 3D printed uppers. With a shock absorbing dual density EVA nitrile rubber outsole and Activ-Step PU anti-fatigue comfort footbed. Features recycled plastic bottle upper textiles, lining and lace materials finished with sleek sports styling. Meets Standard EN ISO 20345:2011 S3 SRC.