Endorsed by the UK College of Podiatrists, Insolia Flex makes walking in flats more comfortable by insuring your foot is correctly placed within your shoes - improving the natural rotational movement of the ball of the foot. Whether worn with jeans or a skirt, over the knee boots are a great way to tackle the temperamental British weather in style. Exclusive to M&S our clever new zips stretch to fit a range of calf shapes and sizes.,Item details: Heel Height for Ladies Size 4 Shoe:22mm,Style: Product Shape:Knee boots, Fit:Regular fit, Fastening:Side zip, Comes in sizes 3-8, including half sizes,Care and composition: Composition: Upper: Other materials & textilenLining and Sock: Other materials & textilenOutsole: Other materials