Under armor uses synthetic zeolite which does adsorb odors but not nearly to the degree that activated carbon (scentlok) does. In terms of raw performance zeolite on its own just doesn't even compare to activated carbon and its ability to adsorb odors. The scent control technology in under armor is virtually worthless in a real world hunting application.
That being said I think under armor makes good technical hunting clothing but the fit is just a tad too snug on my non-Adonis frame.
If it is warmth you are looking for there are other options for arguably a better price. I will say that it is hard to beat 100% polyester for warmth and moisture wicking capabilities in winter months, which UA clothing is predominately made of.
"Warmth without the bulk" is a marketing concept for synthetic fabrics. Yes some synthetic fabrics do have excellent insulating qualities - nothing that outperforms natural fabrics like wool - but it goes hand in hand with their moisture wicking capabilities and usually what is a wind proof membrane that accompanies the fabric. Primaloft is an example of a great synthetic fiber. When it is tightly knitted it can provide excellent insulating and moisture wicking qualities "without the bulk" of a comparable natural fabric like cotton, down, or even wool.
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