Portarò is one of the Geelli items that takes advantage of the main characteristics of the polyurethane gel: adhesiveness, an innate property of this material.‎ This property enables the object to be fixed on a wall at the desired height, without drilling the wall.‎ The adhesiveness of the gel is not obtained with the use of glues but produced by a chemical reaction of the material when it comes in contact with the air, this property remains for the whole lifetime of the product.‎