Inspired by a 1910 patent for waterproofing textiles. It is treated with an emulsified wax which is heat-processed into the cloth for a longer lasting finish and higher performance. The finish is vegan.
This material can be washed by hand, but it would need re-proofing and the surface does change, so it is best to avoid any washing if you can.
Cool setting iron or just finger press.
Do not use any interfacing with this type of oilskin.