UGG Cas Slip-On, But don't worry: we'd never compromise its sleek, streamlined look or its cool, track-inspired style. UGG Cas Slip-On, and women casuals sneakers for style UGG 1019108. Lightweight, cushioned, and flexible, the Cas is bound to become your everyday shoe. This easy slip-on pairs full-grain leather with a metallic leather heel pop for a bit of contrast. Throw on with your favorite jumpsuit for a day look.