These are specially designed for plantar fasciitis. "What makes KURU different? Every KURU shoe comes with built-in patented KURUSOLE tech—a foot health game changer. While many shoes are flat on the inside, KURU shoes are shaped like your feet, designed to hug your heels and relieve foot pain." I am not sure if these are actually a wide width even though there is a W next to size--see picture with measurement. I believe these are leather but not 100% certain.