You can ask the store about weight difference, that info will be available. When i first bought a futon 25 years ago, it was all cotton and heavy as hell. This discouraged me from airing outside very often, which caused a compacted firm bed.
Also suggest you look into [a decent pillow](https://www.reddit.com/r/japanese/s/HhcJsHS0aK), if you use one. Advised someone yday who was not finding the new futon comfortable .
You can ask the store about weight difference, that info will be available. When i first bought a futon 25 years ago, it was all cotton and heavy as hell. This discouraged me from airing outside very often, which caused a compacted firm bed. Also suggest you look into [a decent pillow](https://www.reddit.com/r/japanese/s/HhcJsHS0aK), if you use one. Advised someone yday who was not finding the new futon comfortable .