With its on-trend lug sole and total comfort credentials, modern Chelsea-inspired boot Clarks Calla Zip is crafted for back to work and beyond. Its contemporary chunky profile is still light as a cloud, thanks to a super-flexible EVA sole and the softest cushioning. - Premium black leather upper - Ultimate Comfort 5mm PU foam footbed delivers lasting cushioning - Stretch panels and zip offer easy on/off and a secure fit - Soft textile sock and upper lining - Lightweight EVA lug sole with TR welt, and cut-outs to maximise flexibility - Heel height: 50mm