Have you gotten a swatch? The variety of Polartec fabrics is mind-boggling.
I would be interested in about 5 or so yards of the Power Dry Jersey/Sherling if it is similar to R1 fabric, and if the color is pleasant. My only other concern is what makes it a "second".
Mill Direct are great to work with. I've made baselayer bottoms for my kids from both the X-Static PowerDry and Powerstretch. The X-Static Powerdry is about 3 ounces per square yard and is pretty thin. Note that Polartec yardage weights at Mill Direct are based on the running yard, (often 60" wide), not the square yard. Also they don't have accurate weights for many items. They will send swatches though!