Pearl Izumi long sleeve thermal baselayer

Last week I ordered another baselayer. To my surprise, it wasn't what I expected.
Pearl Izumi Thermal long sleeve baselayer is different than the transfer baselayer.

I have three of these Pearl Izumi transfer baselayer and they work well.

Looking at the pictures, they don't look any different. In terms of warmth, the thermal baselayer is warmer. The material is thicker and feels nice. Hopefully tomorrow I can get up early and go for a ride.