Aqua Safe guard socks, help to protect feet against verrucae and other foot infections. They are recommended for use in public swimming pools, changing rooms, showers, baths and jacuzzis. They have a slip resistant sole and are contoured in shape for more comfort in use. Made from 100% natural latex. Available in 5 sizes from X-Small to extra large. Verrucae and athlete's foot are not waterborne. They are caught by feet making contact with contaminated wet surfaces. This means if you can't find the perfect size, don't worry if a little water gets in. If the sock you have is a bit too tight, a little talcum powder can help to put them on. Extra small is recommended for uk child shoe sizes 9 to 12