Replying to waterproof #

yeas so i am looking at new jackets, and i saw the oakley romeo jacket and it had 6000mm waterproofing, and another one had 10,000mm. just wondering but what is the highest they go up to, or how high should i get one so that it will not get me soaked?

thanks for the help

'If she floats than she is not
A witch like we had thought'
'Like most babies smell like butter
his smell smelled like no other'
'She'll come back as fire, to burn all the liars,
And leave a blanket of ash on the ground.' - Kurt Cobain