The deep-acting impregnating concentrate provides reliable wetness protection for all materials except patent leather or heavily greased leather. It is also ideal for shoes with functional membrane, as it provides 100% protection of breathability. The concentrate can be applied selectively with a sponge applicator and is spray-free, so it can also be used indoors without any problems. In addition, the waterproofing concentrate is environmentally friendly and sustainable. It is 100% PFC-free, meaning it contains no fluorocarbon compounds, which are known to be harmful to the environment. Also, the bottle is made of 100% recycled PE from the recyclable materials cycle and thus contains less plastic, which is good for the environment. To apply the concentrate, the shoes should first be cleaned of dust and dirt. Then the concentrate can be applied specifically to the areas to be treated, such as leather soles, seams or children's shoes.