The io-merino Pilot, sized medium, arrived today (9/4--ordered 8/28. Pretty fast shipping, considering it came from Australia.) It weighs 11.9 oz, has a deep venting neck zip, hobo mitts, red contrasting flat seam stitching at all seams, raglan shoulders, a zipper that goes from the small of the back down, under, and back up to just below the belly button, a waist tie string, and a comfortable, snug-fitting hood with no adjustment. A lot of features for the money.
For comparison, a pair of Ibex woolies pants I have weigh 4.4 oz., and a Long Sleeve Zip-neck Ibex Woolies top weighs 6.3 oz, for a total of 10.7 oz, with no hood. Much as I like the Woolies, the io-merino feels softer and warmer, and the Pilot incorporates much more work. The fabrics are quite different--the Woolies are more of a fine screen-like grid, with clear individual threads, and the Pilot seems to have a finer, less obvious surface texture. No idea, of course, about relative durability.
The late lamented BPL UL long john pant weighed 3.6 oz, and the long sleeve zipless top weighed 3.95, for a total of 7.55 oz., with no hood. These garments are definitely on the fragile side, but wonderfully light.
Also the io-merino has a dragon printed with some kind of overlay material on the left arm. Not sure how many washings that will survive.
So if you get a gig working as a Ninja, the Pilot might just be your cup of tea. It seems very well thought-out and well constructed.