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Take a small square of polythene to sit on, then you just saved all that money buying shit you didn't need :)

and sorry , fleece and sweat proof don't really go together,

if you want to buy once, and it has to be a 'camo' or 'hunting brand' then look at kuiu or Sitka, they are the best brands in the business, but not aware if they do pants with dry seat which aren't...