Other forms: insoles
An insole is the soft layer inside a shoe, under your foot. Replace the insole, a gel insole, orthotic insoles.
Replacing one is the cheapest way to make an old pair comfortable again. A prescribed orthotic insole is a medical device shaped to one person's foot, which is a different thing from a cushion bought off a shelf.
1nouninsoleThe soft layer inside a shoe, under your foot.
“My new boots rubbed until I bought a pair of soft gel insoles.”
insole is a layer.
In plus sole, from Latin solea, a sandal or sole.
From in + sole.
Etymology from Wiktionary, CC BY-SA