Supplied in a protective case these are recommended by dentists to protect your mouth with these shield - they are compulsory for all competitions and a small price to pay to look after your teeth - SIZES - Junior or Senior - the guard can be adjusted for size if you trim a little off the back with a sharp knife -- FITTING - when you have tried the guard and are sure it is the correct length for your mouth you will need a cup of hot (but not boiling) water - Place the guard into the water until it is soft and then mould it to the shape of your teeth - then put into cold water to set the shape