Other forms: windbreakers
A windbreaker is a light zip-up jacket that keeps gusts out. Thin, rustly, and it packs into its own pocket.
It works by stopping the wind rather than by insulating, which is a genuinely effective trick, since most of the cold you feel outdoors is wind stripping warmth away. British English says windcheater or, more often now, a shell. It is not waterproof unless it says so, which is where most disappointment comes from. Runners and cyclists wear them over everything else.
1nounwindbreakerA light jacket designed to keep out wind.
“He pulled a windbreaker on over his shirt.”
Also accepted in games: windcheater
From wind + breaker, from a trademark of the John Rissman company.
Etymology from Wiktionary, CC BY-SA