Camo is also my favorite color. I believe they have an effect. I also believe one layer is enough. Not every layer needs to be scent lok. I have chose to go with the outer most layer. I chose the Savanna so I can ues it all season and just change my layers underneath. Except for my rivers west of course when using that, that is my outer most layer.Dont use either of those or ozonics. I do have a dead down wind puffer bottle so I can tell what the wind is doing. I wont say I dont believe those things dont have some merit but I cant justify the cost based on the merit. I wear camo cause it's my favorite color.