Impregantion by Tarrago, model Trekking Silicone Protector 400, silicone-based impregnation used for all outdoor equipment such as tents, backpacks, sleeping bags. Used for Tex membranes, leather, suede, nubuck, nylon or cotton. it creates highly waterproof layer and protects against moisture, greasy and oil stains and other impurities.