[Fondueset]

I might be wrong - but I think this is essentially the same technique i use. Shivering is pretty much voluntary now. I think the exhale forces you to relax into the sense of cold. I haven't gone below the upper 50s F without a wetsuit - but at those temps I can maintain the sense of comfort for 20 minutes or so - it requires a certain quality of attention - and you have to sort of remember to relax past the instinctive contraction away from the cold.