I think the outer layer should be SL and the inner layers be whatever.
That makes sense. But it‘s probably not a limiting factor, assuming Scentlok efficacy as a given.
The Carbon scent absorptive layer isn’t the exterior layer of their outerwear. I guess if you REALLY believed that the carbon layer was a “don’t pass go” kind of thing, you could even wear used hockey gear underneath. But the reality is, a more systemic approach makes a lot more sense, and if you’re going this route, you’re taking care of all of your garments as much as possible to eliminate scent and subsequent contamination.
I’ve done it both ways, Scentlok outerwear and Scentlok beneath normal outerwear, and haven’t noticed a substantial difference. But I have found either is better than neither.…even if law dogs can still sniff me out. If it’s a placebo of good hunts, I’m fooled. I don’t always use Scentlok, but I grant it some merit.
Scentlok used to have a green liner pant and jacket. I had good luck with those. They didn’t breath well. I would put them on after hiking in. The old (now very old) baselayer models were very, very synthetic feeling and I just didn’t like them against skin. There were two models, and the cold weather ones were better than the others, but I was happier using the liners and the baselayers of my choosing.
There’s some decent Scentlok outerwear now, but I have a few other brand outerwear pieces that outperform them in non-scent related ways. So a mid or baselayer Scentlok layer is something I consider viable. But I don’t always choose one, either.