I wood look at sherwood, They do have the blizzard which my NAPD instructor uses north of the artic cycle so I know it works. I have had my brut (do not rmeber which model) in 20 f water and it was fine. If you are doing PSD then the sherwood also has you covered from contamination. it is a dry bleed system so no bad stuff gets in, it is why I bought sherwood for the Sheriff`s Dept Dive team when I ran it. Hope this helps