A loosefitting heel can ruin your enjoyment of a great pair of shoes. The gapping at the back of the heel between your skin and the shoe itself may look unattractive and may look like you are wearing shoes that are clearly not your size. The gap may also create uncomfortable rubbing against your skin, which can cause unsightly callouses, blisters, or bruises. More alarmingly, shoes that don't fit well can affect your balance and may cause you to slip or fall. Fixing this issue will safeguard you and your skin, and make the shoes look great again.
Insert a heel liner. These are available in rubber and leather. The leather liners may last longer. They also come in different sizes, so you can find a liner that fits the gap between your heel and the shoe perfectly. The liners have an adhesive side which is positioned at the back of the shoe and prevents slipping and friction. The cushioning will help protect against blisters and secure your foot within the shoe.
Wear a tongue pad. A tongue pad is a thick cushion worn under the vamp, which is the part of the shoe that covers your instep. The pad will push your foot backwards so that your heel is flush against your shoe. You can pair the tongue pad with a heel liner if you still have problems with blisters, or you may wear it on its own.
Consult a cobbler. If you have shoes, such as sandals with a strap in the back where you cannot easily insert a heel liner, a cobbler may be able to tighten the straps. This may be accomplished by adding more holes for the buckle, or by replacing the strap with a tighter material entirely. Cobblers can also permanently install layers of leather to the heel if you are not satisfied with heel liners and tongue pads.