The sizing is large,
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This review is from: Ronhill Men's Vizion Reactive Half Zip Shirt (Sports Apparel)
I usually wear X-Large in shirts and t-shirts. X-Large in this was way too big for me so I returned it.
Also I prefer a top with thumb loops like the Ronhill Men's Vizion Kenetic 1/2 Zip Tee.
Also the detail at the elbows was a bit strange and potentially quite irritating.