It is an excellent water based tonic that will form a water resistant barrier to protect your nubuck or suede shoes from the wet weather.

Are Grenson suede boots waterproof?

For suede/nubuck styles

Whatever you do, don't use water. Instead, you can get suede protector or Grenson's own Suede Salvation to help form a water-resistant barrier to protect your pair.

Is Grenson a good shoe brand?

Grenson is a shoe company that has been around since the 19th century, and the name is iconic in the UK. Some feel that their quality has been declining, but I think it may be more cases of misplaced expectations. Overall, I would rate these shoes an 8 out of 10 which is well above average.