I have this and the matching pants. It is always my go-to baselayer. It handles heat and moisture better than any of my synthetics, but it's most redeeming factor is found in merino wool's ability to handle odor in ways synthetics normally can't. I use this baselayer for ice climbing, skiing and winter backpacking. It's comfortable (not scratchy at all) and non-restrictive, even though it's not a loose fit. I can't say enough times how impressed I am with this product.