Natural Sea Sponge - Classic. Sea sponges are the most natural and healthy way to cleanse and care for the skin.. Natural Sponges are more resistant to acids and they are easier to clean than the synthetic sponges.. Sea Sponges are permeated with natural enzymes that inhibit the growth of mould, mildew and bacteria.. Sea Sponges hold more water than artificial ones. A natural sponge will hold two to three times as much water as an artificial one.