F = Standard fit. Designed with growing room - no need to size up. Start-Rite's new breathable vegan-friendly non-leather school shoes have new Air-Rite technology to keep feet happy throughout the school day. Highly durable and water-resistant, these stylish school shoes are made from non-leather breathable upper linings to provide all-day comfort and style at school. Don't forget to add a Start-Rite measuring gauge to your basket - fit at home the Rite way using the video to help you.