I have some of the scent lok and scent blocker clothes and in my opinion if you take care to eliminate your scent by showering with no scent shampoo, using no scent detergent, using no scent spray etc and couple that with the scent lok clothes it can be very effective. If you hop out of bed and don't shower and just throw your clothes on and hop in the truck and smoke a few cigs on the way over and climb into your deer stand then no its not going to work. I didn't buy the clothes thinking for even a second that they would just make me magically disappear to the deers nose. I'm not an idiot. But when used in accordance with the above mentioned steps it is very effective. I have bought all my clothes after season when Dicks puts them on sale at about 1/3 price of normal so I don't have hundreds of dollars invested in it.