I've wore layers of Scent-Lok since '96 and continue to add more and more pieces to my carbon wardrobe every season and it's my strong opinion that the Base Layers are the most ineffective garments that they've made to date. They just aren't more than breathable underwear... not impressive at all. I would MUCH rather keep my under layers as scent free as possible and then go with an over layer of carbon. It is vital that your outlayer leave no trace to and from your stand, I believe this is key to a successful whitetail strategy and seems to be getting more and more overlooked as folks buy just the newer under layers. Just my 2 cents, good luck