I loved having this shirt (and the matching shorts) when floating the Middlefork Salmon river in Idaho in early August. I had full mobility while paddling kayaks and river rafts. They fit well, were comfotable, and kept me warm, but not too hot as long as I kept getting splashed (which was inevitable).
This lightweight 0.5mm neoprene fabric features a plush polyester inner lining that is comfortable against the skin and retains less water. Combined with a Durable Water Resistant (DWR) coating on the outer surface, NeoCore helps regulate body temperature by reducing the effect of evaporative heat loss.