The reason they failed is quite simple and perfectly illustrated by my sister. She held her wedding in a big field and bought a pair of nice blue Hunters for the occasion. They cost over £150 but a year later they were perished and leaking. Hunter fell to little more than capitalist greed - they pumped up prices while making the product progressively poorer.
Metro.co.uk: Hunter wellies: How the festival footwear of choice fell out of favour https://metro.co.uk/2023/06/20/hunter-wellies-how-the-festival-footwear-of-choice-fell-out-of-favour-18977415/