Sideburns wrote an answer about Atlas 12 Series Snowshoe on October 30, 2010
I use a 12 series in 25in and weight 190lbs. It works fine in every snow condition but powder. In the sidebar it says the 30in is for 150-250lbs and the 35in is for 180-300lbs. If you are going to use it in deep powder I'd go with a 35in.