It's proven good on 40/50f days coupled on top with the Thermal Jersey & Wind Vest. At ~38-42f I'm comfortably warm using it under a long sleeve base or Thermal Jersey and a Magic Shell.
My go to base layer. Been using it under the LS trail shirt when riding and it does its job...and then some. Soft,no chafing & dries quickly. Great under your sweater or button down too. Highly recommended.
needed this like yesterday. soft, comfy and warm at just the right time. Pairing with the house jersey at the moment