Waterproofing sprays used to be quite toxic back in the day, but fortunately nowadays there are also water-based alternatives like the Lowa Water Stop Eco. The easy-to-use spray improves the shoe's water and dirt repellency. - Suitable for leather, textile and artificial leather - Also suitable for membrane shoes (e.g. Gore-Tex, DrymaxX, Sympatex, eVent, etc.) - Does not contain PFC's - Package size 200 ml This is not a pressure pack, the substance is sprayed onto the surface of the shoe with a pumping motion. You can print [Lowa's size guide](https://backend.lowa.com/media/pages/279dbaf5-f17d-8f8e-f346-2fa87f33af08/f5824c15-4898-7842-05dc-fc1c15437963/67d595c7-df97-d740-ea02-47a08f43b1c9/adae9d706e-1705483145/size_sheet_uni_en_08_21.pdf) and use a credit card to measure your foot. The card is used as a spacer to place the A4 paper just far enough from the wall that its length is suitable for use in this way.