Stella McCartney Footwear Size Chart Synthetic uppers Stella McCartney® Soft Alt Leather Air Slide Sandals. Synthetic linings and non-removeable insoles. Slide style. Pointed toe silhouette. Synthetic outsoles. Imported. This item may ship with an attached security tag. Merchandise returned without the original security tag attached or a damaged tag may not qualify for a refund. Weight of footwear is based on a single item, not a pair.