Product Description The PM4010 Boston is a breathtakingly lightweight safety trainer that has been manufactured using a supportive TPU cage upper, that offers outstanding foot support and breathability. It has a 100% non metallic construction, including a fibreglass toecap and composite midsole. Boston is an ideal choice for contracts due the vegan friendly materials and sleek sports styling enabling it to be ‘the one for everyone’. The outsole complex is a dual density EVA nitrile rubber outsole which gives abrasion resistance whilst providing exceptional shock absorption and weight reduction. All day comfort comes from an Activ-Step® PU anti-fatigue comfort footbed.