Flex Appeal 4. 0 Trainers Womens Step out with the Flex Appeal 4. 0 Trainers brought to you by Sketchers. In a sporty style, this trainer is designed with a fabricated upper perfect for a flexible fit, paired with an Air Cooled Memory Foam insole for added comfort and durable all day wear. Sat upon a rubber outsole and shock-absorbing mid-sole, these trainers are designed with a full tonal lace fastening, heel pull tab and padded accents to the upper for ultimate support. This super lightweight fit is perfect to wear on-the-go or at the gym.