Longman Dictionary of Contemporary English
showerproof
adjective
EXAMPLES FROM CORPUS
▪ An when the Tactel's on the outside the jacket is also showerproof.
Wiktionary
showerproof
a. That doesn't absorb water in light rain.
Usage examples of "showerproof".
Where I had a showerproof jacket over an ordinary suit and no hat, he had come equipped with the full bit: a red padded cap with ear flaps fastened with a strap under his chin, blue padded trousers tucked into short wide-legged gumboots, and a red padded jacket fastened up the front with silver coloured press studs.