Brands and retailers across the country have been dealt heavy blows by the spread of COVID-19, and comfort footwear brand Vionic has proven no exception. Owned by footwear giant Caleres—whose portfolio boasts brands like Sam Edelman, Vince, Dr. Scholl’s Shoes, Via Spiga, Naturalizer, Franco Sarto and retailer Famous Footwear, among others—the Bay Area-based label has…