The best thermal layer ever, it keeps you warm in any conditions. I use it for a downriver and then use it for playboating, it is also great because you can put it on wet and once you get it warmed up with your body heat it's good to go.
The NRS HydroSkin Shirt LS is warm by itself on moderately cool days and makes a great cold weather base layer. Hydroskin can be a life saver in the event of a cold swim. 0.5-mm Terraprene keeps you insulated and stretches easily.
NRS's Hydroskin Wetsuit Shirt Features:
ThermalPlush inner lining increases insulation, repels moisture and dries quickly.