Review on Duofold Women's Mid Weight Wicking Thermal Shirt: Stay Cozy and Dry All Day by Ron Long

I'm taking a trip to Iceland next week and being from Florida I knew I had to do some research. I read on several websites that I would like to try the thermal top and was directed to this link based on these rave reviews. I'm not sure if I'm lucky or not, but this shirt doesn't keep me warm at all. It's literally no different than the long-sleeved cotton t-shirt you can buy at Walmart. I decided to wear it today as we had a cold front and thought it would be a good way to break it in before the trip. So frustrating to wear this and realize it was a waste of money and I would be better off with the long sleeve t shirts I already have. Also, many reviews recommended ordering a size up. I usually have M - I ordered L and it's MUCH bigger.