What is the opinion of Reddit about the
Half-Moon Pillow?

That’s ok, I saw it. Have you thought of maybe trying this (since it’s just your foot).

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https://www.amazon.com/Edomi-Buckwheat-Sleeping-Adjustable-Cervical/dp/B0872L6WVQ/ref=sr_1_7?dchild=1&keywords=husk+filled+small+pillow&qid=1632091378&sr=8-7

It’s a buckwheat filled pillow, which has some weight to it