noun
Refers specifically to the underside of the foot, from the toes to the heel.
足裏のマッサージは気持ちいい。
A sole massage feels good.
裸足で歩いたら足裏が痛くなった。
My soles hurt after walking barefoot.
Rare kanji form; not commonly used in modern Japanese.
More common and slightly more conversational way to say 'sole of the foot'.
Compound of 足 (foot) and 裏 (back, underside). The rare kanji 蹠 is a specific character for the sole of the foot.