The Aqua Sponge HC3 easy grip polyester sponge is hydrophilated for maximum absorption. The easy grip turtleback design makes it popular with paperhangers who choose not to use a natural sponge. This professional-grade sponge can be used for all types of cleaning projects. The easy grip design and durability make it the preferred synthetic sponge used for wallpapering. The HC3 hydrophilated polyester sponge stays soft, floats and is easily sterilized by boiling.