The inner spacer comes in two varieties, made from either hard plastic or a slightly softer polymer. The hard type, they say, is rigid enough to create a wide gap between the face and the mask, and is especially good for people who have issues with the mask pushing up and into their eyes. (I can relate to this problem immensely.) The soft one is not only a little more subtle, it can also be a more secure fit for some.
At 868 yen for a set of both varieties, is it worth buying the inner spacer and testing just how well it works in the gross humidity of the Tokyo summer? I'm still on the fence about that. If you want to learn more about Tokyo Chikuma Kasei Co., and see where they're selling the inner spacer, you can check out their official website
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