I have a double garage on the side of the house, i can get into it from the house and its great, love it, only problem is its now getting cold and i cant be arsed going out there when its freezing so how can i sort this out.

Is there something i can put round my garage door to stop the drafts coming in without affecting the door swinging up? Also is there anything i can put on the door to insulate it from the outside, flat foam insulation cut to size?