outsole

详细解释:n. 皮鞋的鞋跟

英语解释：

名词 outsole:

the outer sole of a shoe or boot that is the bottom of the shoe and makes contact with the ground

详细解释：

out.sole

n.（名词）
The outer sole of a shoe or boot.
鞋跟：鞋或靴的外底