Crafted from smooth nappa leather, these luxe sandals offer poolside ensembles a perfect blend of sporty sensibility and fashion-forward style. About APL A seamless blend of luxury and performance, APL short for Athletic Propulsion Labs is a line of footwear designed to enhance every experience. Whether you're traveling the globe, training in the gym, or relaxing on the lawn, APL's high-end sneakers are there to offer cutting edge support with sophisticated style.