many use footwear to protect themselves from weather and dirt. there are multiple kinds of footwear, for example "sandals", "shoes", and "boots". when people do not remove footwear, especially in hot places or when they are very active, their feet can smell badly ("foot odour)". wearing footwear that is too big or small can be bad for the feet, causing blisters. people who have foot, leg, and back problems can also get help from special shoes.