Engineered Knit Vegan Air-Cooled Memory Foam Machine Washable. Skechers Flex Appeal 5.0 trainers are designed for comfort and style. They feature an engineered knit upper for breathability and a vegan construction. The Air-Cooled Memory Foam insole provides cushioning and support for all-day wear. These trainers are also machine washable for easy care. Available in Pink and UK size 4.