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Used it since it came out, it has to be extremely cold before I can wear it, but I can go really light with it on. If early spring fishing it is good and sitting tree stand, but moving I just get too hot in it.. I do however utilize the hot gear all the time, tops as an exterior shirt..
I recieved a set of Cold gear base layer last year as a birthday present. Works very well, does keep a guy dry and helps release moisture really well. I have alsobought the compression cold gear stuff that Cabela's is marketing and I think it works darned close to just as well for half the price.