[Closed] Heated socks Thermic brand

Looking at options of heated sock due to back circulation in my legs/Feet
I have a pair off Amazon which do take the nip out the cold but battery longevity is poor and needs ran at lower temperature to last a 4/5 day on the trails

I’ve looked at Thermic socks and they look great,But at £120+ are they better than the Amazon jobs?
They’re claimed as a guard against Reynaulds disease so assume they’re a grade above

Anyone have real time use of these