The Black Diamond Midweight Wool Liners blend merino wool with recycled polyester and a touch of elastane, so they dry quickly without losing the wool's natural ability to keep hands warm even after they've gotten wet. That combination makes these liners just as useful worn alone on a mild day as they are layered under a heavier glove when temperatures drop. What Our Gearhead(R) Experts Are Saying:"My hands sweat through liners fast on a skin track, and these are the first pair that still feel warm once they're damp. I've worn the same pair wet for hours without my fingers going cold."