What is "tennies"

Usage examples of "tennies".

Winos in tennies, skinny fags in tight pants and whores in purple skirts all ignore the world beyond the local bar, care about nothing except where the booze comes cheapest or the latest score on the radio.

Rose Chernin, a little old lady in tennies, and Dorothy Healey, a Communist Party official, come up to me and introduce themselves.

I kicked off my slippers and laced up my tennies, then pulled on a sweatshirt.