The MEC T3 Hoodie is a terrific base layer that is impressively warm considering its minimal weight (7oz / 205gr). It is very similar to Patagonia Capilene Thermal weight but about half the price with better features (Canadian $ is weak so you get more for your money even after $15 for USA shipping)
I really like the fitted hood as I can wear it under my ski helmet on cold days (rather than bringing a balaclava). I also appreciate the extra long zipper (just above belly button) as it aides in ventilation. The thumb holes are more robust than on most shirts and with the extra long sleeve length it definitely helps to keep your hands warm. I haven’t had an opportunity to really test out the wicking/breathability of the shirt but the waffle knit helps to promote airflow.
The fit of the shirt is a little odd. I am 5′ 10″ and 155 lbs and typically wear a medium and sometimes a small depending on the cut. I bought this shirt in Medium and I would describe it as a fitted cut with extra long sleeves and a long overall length. The oddest part of the fit are the arm holes…they are considerably smaller than I’d like for a piece of active wear I might wear a layer underneath. Even without an undershirt things feel a little constricted. Luckily the fabric has a fair amount of stretch and moves well with the body. I would suggest sizing up if you are borderline between sizes, especially if you are broad chested and/or large shouldered.