There is a series of very in depth podcasts about this from Blister. They chat with one of the team from Atomic who describes how they balance the first fit feeling with actual comfort after hours of use. I think rental boot liners are often padded out with thicker, softer foam which makes them feel comfy when they are new and you first put them on, but then eventually they pack out, your foot slips around and they just feel dogshit.
That's exactly my experience. Great for day 1 and 2, ok day 3, then they were literally 1-2 sizes too big. Tried to pad them out with socks and insoles but it just doesn't work
There is a series of very in depth podcasts about this from Blister. They chat with one of the team from Atomic who describes how they balance the first fit feeling with actual comfort after hours of use. I think rental boot liners are often padded out with thicker, softer foam which makes them feel comfy when they are new and you first put them on, but then eventually they pack out, your foot slips around and they just feel dogshit.