"Fit into the screwfix site work trousers (bit tight but then you don't want them moving about!). Spent a day grovelling on the floor on them and saved my knees so they've paid for themselves already. No visible wear on them but can't comment on longevity."
"I'd bought a set of Site Mastiff Trousers and was asked about the knee pads. This was something that I had overlooked and they were cheap so I went for it. Wow glad I did. They fit without any cutting and do exactly what they say. So far have laid some loft board so on my knees a lot and was comfrtable the whole time. Thanks Screwfix"