- Size: 42 • Outer material: polyester and spandex, providing a comfortable feel and allowing for easy on and off. • Inner material: synthetic, flexible and soft, with elastic material for easy folding and elastic collar for added comfort. • Non-slip and durable rubber sole, ideal for various activities such as fitness, yoga, pilates, spa, relaxation, beach, water park, and hiking. • Flat heel, lightweight and flexible, protecting your feet from stones, shells, and other sharp objects. • Slip-on design for unobstructed comfort. • Product measurements: 5 cm wide, 5 cm high, and 16 cm long.