Obviously effective, because the shoes stay dry inside without a GTX membrane.
Honestly, I don't know what difference it makes to the boots after I've polished them with Meindl wax. I think it's unnecessary.
A highly absorbent protective spray that doesn't make a mess or smell awful. It also seems to do what it promises.
A highly effective spray for all membrane shoes.
Do what is expected
I've been using it for years, and I don't see any harm in it.
Gives the shoe a good film. Easy to add.
Good product.
A little heavy, but warm and well suited for my intended use (winter landscape photography in Kuusamo).
Good moisture barrier.