You do not need to impregnate the hybrid boots in order for them to maintain their waterproofness, as the neoprene and rubber themselves are waterproof. Hand wash your hybrid shoes in lukewarm water with a soft sponge or cloth. Do not use strong detergents or anything that contains oil or acid.Condensation can form inside the shoe when used, which makes the lining damp, so it is good to remove the insole for ventilation and let the shoe dry without the sole until the next use. Therefore, all our hybrid shoes have a detachable insole.