Caution: Joybees are made of EVA. EVA products will shrink if exposed to heat. They will not shrink while being worn. To make sure your shoes last throughout the season we advise keeping your shoes out of direct sunlight and excessive heat to prevent shrinkage. For example, don’t leave them on the front seat of a hot car while at soccer practice. In addition, do not expose your Joybees to chemicals such as insect repellent, fertilizer or harsh cleaning solutions. All you need is some cool, soapy water, and light scrubbing to make your Joybees good as new.