I personaly own one scentlok suit, and one scent blocker suit. I think both work. Do they work perfectly, no but I do believe they help. Personaly the only way I believe possible to contain all your human odor is being in a air tight box but those are a tad hard to shoot from. One simple test I have tried on many occasions is sitting in my treestand and cutting one loose "farting" and when you do that wearing normal coverals the smell tends to come right up through the collar and you no doubt smell it. When I wear either of my carbon suits and fart I never smell it, not once. So take the test go try a scentlok or scent blocker suit on at a store and fart let us know if you can smell it.