Swobo's new 753 is a blend of 23 percent merino and 77 percent polyester, and that's where the magic lies. The ultralight merino yarns are on the inside, next to the skin--it's like a thin wool base layer built into your favorite lightweight, long-sleeve jersey, with a snug, race-ready fit that includes a handy fulll-ength zipper and three rear pockets. For moderate temperatures, the 753 is perfect on its own: supercomfy, with a little wind-blocking capability. The overall lightness and whisper-soft inside make it feel barely there, and it won't sag or become heavy if you're caught in a rainstorm. We also like the subtle good looks of the red flatlock stitching over silver.