I was recommended to use this product on my old waterproof jacket and trousers, which seemed to be letting the water in quite a lot nowadays. I was a bit sceptical, but thought I might as well give it a go and am amazed by the results. It really does do what it says - and I've certainly had lots of occasions to test my rewaterproofed garments in all this rain. So I would recommend this product- get the big size, as you need quite a lot, but it's well worth it and so much cheaper than buying new waterproofs. It has even made my daughter's very cheap coat as good as any expensive brand. Only downside is an initial "vinegar" smell on the garments, but this soon wears off once worn.