In reply to EvanDavies: I use a fusion sometimes in winter when the day is likely to be short and the weather ok. Usually have a marmot dry climb underneath to help with wind proofing. Combo works well, stops the snow / ice getting you wet without loads of condensation and overheating. Wouldn't relay on it in poor conditions unless I knew it was going to be cold (no rain) then my belay jacket could keep out the elements.