Walmart suggested I needed a medium. I normally order a small, but though I'd go with the suggestion. Should have ordered the small.lol. Other than it being the wrong size, I love this shirt. It a very warm base layer, and would have fit great if I'd ordered the right size. The material is very soft, and very nice. It feels like it would be moisture wicking. Haven't tested that yet though. I ordered Five different shirts, trying to find a new base layer shirt to replace my aging set, (since they don't offer my old shirts anymore) and this one is the winner. I will be ordering some more of these. Small this time!.lol.