Helly Hansen Workwear Chelsea Evo 2 Low O2 HtChelsea Evolution was built for use on dynamic work sites where you need lightweight protection that delivers on all day comfort. This concept has been updated with a high rebound EVA midsole and Ortholite X25 Hybrid footbed for improved comfort. Weve also updated our breathable and moisture wicking lining materials to include at least 50% recycled content. The new streamlined design also includes reflective details for increased visibility on and off