Glow-in-the-dark textile/synthetic uppers. Vulcanized rubber sidewall and outsole. Removable Custom CloudBound foam insoles for all-day comfort and support. Dual elastic gore for easy fit. Lightweight, flexible slip-lasted construction with recycled strobel board Outsole height is approximately 1". Exclusive to TOMS.com. Your TOMS purchase helps support childrens education, health and well-being, giving kids everywhere the gift of better tomorrows.