I bought a pair of boots in the US. They were advertised as being waterproof, but after some [reasonable] use they ceased to be waterproof. I called the company, and their response was basically:
The boots should have been waterproof, they weren't. We're sorry, we'll give you a brand new pair.
They kept their word and replaced the boots. The new ones, so far, are waterproof and they have retained a happy customer with dry feet. But all this leads me to wonder. If it was a manufacturing defect in my original pair that caused them to fail then it's completely likely these new ones will remain waterproof for the remainder of the warranty period. When they eventually fail, I'd just buy a new pair.
But what if the boots failed because the design of the boots is not good enough to stay waterproof for the whole warranty period? If these new boots fail within the original warranty period should I expect another replacement? As a general rule, is a company who warranties their product responsible for making it right for the entire warranty period even if that means multiple replacements?