Same with anything ‘technical’ or ‘sport specific’, price seems to double or more. I suspect most of the extra goes on branding/advertising/sponsorship and there is not a huge (if any) benefit to the end user. I find that the price also depends on the popularity of the sport and if you carefully cross-match and cherry pick eg. mountaineering gear with skiing or general active workwear, you can get as good or even better gear for a fraction of the price.
First example that springs to mind is Bolle sunglasses – about £7 for workwear and £60 + if you go for skiing
Also Lidl/Aldi make very decent gear much loved by the non-label whores 😉