broken-in
adjectiveUK /ˌbrəʊkən ˈɪn/
US /ˌbroʊkən ˈɪn/
Made soft and comfy by being used a lot.
I love my broken-in sneakers because they feel like slippers.
OTHER MEANINGS
2. Trained to obey and work with people, said of an animal.
The broken-in horse stood calmly while the child brushed it.
3. Made used to a new job or situation through practice.
After a month, the new intern felt broken-in and knew everyone's names.
4. No longer stiff or new, especially of clothes or shoes.
He wore his broken-in jacket on every camping trip.