Not sure but I saw some underwear with the same stuff in it. Long johns and a long sleeve t shirt. You could get both for about 60 bucks. Not nearly as expensive as scent blocker or whatever with carbon. Probably just another gimmick though.[]

While I agree, hunting into the wind is a must, in the ravines and canyons I hunt, swirling winds seem to be the norm, and any additional help I can get in the scent department might be worth a look but not at a couple hundred bucks.