This past season I used the X-scent longjohns that I bought at Wal-Mart. Killed the biggest buck of my life, so they obviously work! I actually really liked the X-scent stuff. Very light weight and comfortable. I'm of the opinion that if the undergarments are effective maybe the scent control isn't necessary in the pants and jacket. For those I worry more about weather-proofing and how noisy they are. From what I've heard and read, silver may just make carbon obsolete before too long.