When filming outdoors I use a small shotgun type microphone on the 70D.
This one I bought from China:
It is supplied with a foam wind shield which doesn't work very effectively, if at all, to suppress wind noise in blustery conditions:
The best type of wind shield is a fluffy one which breaks up the wind but still allows the sounds you want to reach the microphone. I bought a cheap one to try out and fitted it over the foam:
A couple of days ago I was filming a Blackbird singing at dusk. There wasn't much wind but a couple of times there was a short blustery outburst. The fluffy shield coped well with that as you can hear, or not hear, on the video tomorrow.
29 minutes ago