Bentle

Adjective to describe something as being good or trendy, usually with a prefix as in "well Bentle." East London slang used by trendy "hipster" twenty-somethings.

The shortened form of the spoonerism "Bentle Gen" created by swapping the first letters of each word - which refers to children's American TV series "Gentle Ben" which was re-run on UK children's TV in the 1980s.

Those trainers are well Bentle.