3 pairs will fit most B and C Class models plus some others probably. One set used a couple of times the other 2 still in bags. Think they're about £70 a pair new. Photo shows size range.
We're going skiing twice this season, one of them in mid-February when the snow can be quite severe. Last year we went in a LandRover Discovery, which was on all terrain tyres (General Grabber AT, they have a snowflake on the side), and it was superb. The driving conditions were really tough...