Apparently, some types of sandals can shrink when left in the sun for prolonged periods. This issue has been known to affect Crocs, for instance. There’s a quick remedy for that. Just wash them in very hot water and put them on immediately, with some socks preferably. On the other hand, you can use heat to shrink Crocs that are a bit loose. Plastic sandals might also be damaged under intense sunlight. At the same time, prolonged sun exposure might also damage natural leather sandals, making them stiff.