10According to the Explanatory Notes to heading 9021 orthopaedic articles and appliances are for ‘preventing or correcting certain bodily deformities’, or for ‘supporting or holding organs following an illness or operation’. They are ‘orthopaedic footwear ... made only to measure’ and ‘special insoles, made to measure’, and ‘orthopaedic foot appliances (talipes appliances, surgical boots, etc.)’.