Impervious to or resistant to wind: a windproof jacket. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "windproof" in a sentence
"The latest models aim to be windproof, meaning that they are made to withstand powerful gusts without turning inside out or breaking."
"They tell me that every one here puts on fat in the cold weather as a kind of windproof jacket."
"If you're starting from scratch (and don't want to look like a 200-lb. bumblebee, like I do), look for wool insulating layers and some kind of windproof shell."