What puts the wonder into WonderWelly™? FitFlop set out to turn an iconic silhouette into the world’s comfiest welly with their biomechanically engineered technology. They contoured the sole to evenly distribute bodyweight, filled the hollowed-out heel with their innovative honeycomb design that absorbs the impact of every step, and placed high-rebound micro ‘springboards’ in the forefoot of these lightweight waterproof boots to help put a spring in your step. Here in the short version.