Trekking Expedition takes our best-selling Trekking comfort and upgrades it for full-coverage performance. With a closed toe and heel, lightweight feel, and supportive honeycomb footbed, it&';s designed to move effortlessly from everyday errands to weekend getaways-finished with a grippy outsole for secure, all-day wear. Joybees are made of EVA, which will shrink if exposed to heat. We advise keeping your shoes out of direct sunlight and excessive heat. They won&';t shrink while you&';re wearing them, but don&';t leave them on the front seat of a hot car while at soccer practice.