this invention provides new gels in the form of highly hydrated self - supporting film , comprising one or more alkaline alginates , an alkaline earth alginate , a polyalcohol and a natural , synthetic or semisynthetic polymer of hydrophilic nature , and their preparation process . these polysaccharide - matrix gels in highly hydrated self - supporting film form are suitable for use as covering and protection materials for cutaneous lesions and / or pathologies in that they are obtainable in self - supporting form in the desired thickness , are transparent , flexible , have good mechanical characteristics , are adaptable to the lesion surface without strongly adhering to it , and are permeable to gas but are impermeable to liquids and bacteria ; one or more pharmacologically active substances can also be incorporated in the gel .