Rubber and elastic bands are both used for fixing due to their high elasticity and stretchability, but these materials will lose their shrinkage tightness due to prolonged pulling. Therefore, it must be removed from time to time, and let it return to its original tightness, which will be more durable and less likely to lose elasticity.
The glasses cover must also be taken off for cleaning and soaking in hot water from time to time. Since the surface of the material cannot be rubbed or brushed, you can add a small amount of vinegar to dilute it in hot water, or soak it in a bleaching agent specially designed to bleach colored clothes. At the same time, the eye mask soaked in hot water is also less prone to aging and hardening. This method can also remove the dirt and old stains that are difficult to clean around the glasses.
If the glasses shades and elastic bands are no longer usable, you can go to a store specializing in handicrafts to buy replaceable elastic bands. If you are lucky, you can even find exclusive doll glasses to replace them, but the price will be more expensive and the style will be relatively simple. You can also go to a sporting goods store or buy swimming goggles for children as a substitute. If you choose the right one, there will be unexpected results.
