100% non-metallic, with protective toecap and midsole, Boston is comfortable and lightweight, it’s developed with innovative comfort materials including TPU upper, a shock absorbing dual density EVA nitrile rubber outsole and Activ-Step? PU anti-fatigue comfort footbed. EN ISO 20345:2022?S1PS FO SR UK 6-12 (INC 6.5 and 10.5)