Listings describe the boots as waterproof with non-marking outsoles. Outsole material varies by listing: some specify a fully waterproof PVC outsole, while others list the outsole as 60% leather / 40% PVC.
They have a polyester lining and EVA insoles. The EVA insole is described as encouraging independent dressing, and easy pull-on loops are also listed to help with putting the boots on.
Playful details include molded PVC spikes in bright green, step-activated light-up action lights (blue, white, and red), and an overall dinosaur theme with fun molded accents.