Hi, I’ve read here that after a precise CFM, increasing the CFM does not increase the breathability but still decrease wind protection, which is suboptimal. Sometimes I read 35 CFM it’s that precise value, some other times I read it’s 40 CFM. Could you tell me the precise value once and for all? I’ve also read here that a wind jacket gives insulation by trapping the air and that that insulation is extremely gram-efficient. The post said that this insulation was same whatever the CFM rating of the windshirt… how is that possible? I would have tought that a lower CFM trap more air and insulate better (getting closer to VBL the lesser the CFM). I guess I was wrong, but could you please explain me how a 5 CFM windshirt, a 40 CFM windshirt and 60 CFM windshirt can trap the air as efficiently and/or insulate as much.
Thank you
