I can’t speak to what style they used in Japan, but a little bit of ergonomically correct neck support is a lot more comfortable than having your head directly flat. If they are scooped into little cups that fit your skull and polished smoothly, I can imagine them being quite comfortable even without much padding. It wouldn’t take much padding to make them surprisingly comfortable if you’re a back sleeper. It’s similar to how a master carpenter can make a wooden chair that’s extremely comfortable just by shaping it and smoothing it correctly.
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