What puts the wonder into Wonder Welly™? Using the science of biomechanics, we set out to turn an iconic silhouette into the world's most comfortable rain boot. We contoured the insole to work with your natural alignment; filled the hollowed-out heel with impact-absorbing honeycomb cushioning; and engineered the outsole for flexibility, with high-rebound 'springboard' ridges at the forefoot to propel you forward with each step. These game-changing waterproof boots are also ultra-light and supportive. Unbeatable for long walks, here in the short version. This shoe has been granted the APMA Seal of Acceptance. The APMA Seal is for footwear found to promote good foot health. American Podiatric Medical Association