<s>[INST] I have just been fitted with an air cast boot as I have broken 2 bones in my right foot by my small toe due to falling down stairs. I am worried about the size of the boot I am wearing due to me giving the wrong shoe size (UK 6 but the boot is size 6 Canadian size as it was fitted in a hospital in Canada) Will this delay or do more harm to the bones healing correctly. I would appreciate your advice so that I will have time if necessary to go back to the hospital. [/INST] hello foot fracture bones are aligned right, purpose of boot is immobilization. Only thing is cast shouldn't be loose enough to permit movement of fracture site. If not, then nothing to worry, if loose, then padding or change may be needed, so see an orthopedic doctor. If only crack fracture and no displacement requiring re aligning fracture ends, no worry even if boot oversized-the idea is only to take weight off the foot on standing or walking, it will heal fine. If initial fracture displacement required setting of fracture ends, then do visit hospital to review with check x-ray if alignment is disturbed and may require resetting and correct size snug boot best wishes </s>