Because they’re a cup, they provide much cushioned relief to the back of heel, as well as bottom of heel. I’ve tried everything (for years!) from $800 orthotics to various stick-on-foot products and stick-on-shoe products for plantar fasciitis and back-of-heel blisters due to Haglund’s (bone bump on back of heel). They are rather thick and don’t fit into my dressier shoes, but I assume the thickness is what provides the comfort. Best product I’ve found for my needs!
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