There are a number of items referred to as rain guards. I am assuming that you are referring to the rain guards that are mounted on the outside of a car window. These are also referred to as side window deflectors.
The side window deflector is used to keep rain or wind from coming into the car when the window in open a small amount. People often leave the window partially open to get ventiliation or when then smoke. The rain deflector will allow the air to circulate or the smoke to leave the cabin while keeping rain and wind out of the car.
The side window deflectors are custom designed for each vehicle.
Umbrellas, ponchos, raincoats, hats, boots, etc.
unbrella
swim suit
jacket
house
roof
hoodie
coatt
your an idiot :D
umbrella
mackintosh
A waterproof raincoat is a shell whose purpose is to block the rain.
http://www.enotes.com/how-products-encyclopedia/raincoat
Charles Macintosh invented the waterproof coat in 1824
anorak raincoat!
Plastic is easy to mould into garments, and is waterproof.
winter knits, watch, wrap, wetsuit, waterproof raincoat
raincoat, umbrella, stay inside, waterproof clothings and shoes.
A "waterproof cloak" or "raincoat" in Spanish is "impermeable". It is pronounced "eem-pare-may-AH-blay". Please see this site for confirmation of the translation: http://www.answers.com/library/Translations
Gore-tex
You can't use a property, as it's a description of something a substance does. A better question would be to ask 'What are the properties you would look for in a material to be used for a raincoat?' You'd want it to be waterproof, flexible, hard wearing and comfortable.
No, raincoats can't be made of silk or wool. The main function of a raincoat is that it is waterproof, so rain slides right off without the person wearing the coat getting wet. Silk and wool are not waterproof.
imperméable means that water cannot go through / waterproof as a piece of clothing, an 'imperméable' is a raincoat