The brand is UNDER AMOUR, maybe made by the same place your columbias are. These dont even look like regular thermals tho...
Ahem.... UNDER ARMOR. "Armor" like prtection or a shield.
It is a blend of nylon and polyester. They make athletic appearal like shorts, socks, and under wear. Thier blends are supposed to wick moisture away from your skin keeping you dryer, therefore cooler. I have hade the thermals for awhile and won't use anything else when I'm in below 35 ish degree weather. Watchout you don't wear them when it's too warm or you could get too hot and want to pull them off.
You can get them through sporting goods stores, Cabela's, Gander Mountain, Under Armor website,.....
The log looks like a big X.