Sitka Gear's next-to-skin layers are really nice. They have some kind of silver in the lining which does a great job at killing smell, plus they transport the moisture to the outside and keep your skin dry. I shot a 3-D range four times over two days wearing the same top and it smells fine and I was comfortable. They also make one that zips pretty far down the chest for extra venting when walking in a long ways or climbing. I wear them as my main layer when hunting in the heat, and then wear them as my next-to-skin layer when layering other stuff on top as the weather dictates.