What Our Gearhead(R) Experts Are Saying:"I've worn this on hot summer rides under a light jersey and never dealt with that clammy, sticky feeling by mile fifty. The merino wool handles sweat way better than any synthetic base layer I've tried. It's now a permanent fixture in my warm weather kit."The Merino Short-Sleeve Base Layer is made for the rides where the sun's out and the effort's real, and you need something underneath that keeps up without adding heat. Rapha built this layer to sit close to the body, so it works with your jersey instead of against it, disappearing into the ride from the first pedal stroke to the final climb. Merino wool takes care of the hard part, pulling sweat away from the skin and managing odor mile after mile, while a blend of nylon and elastane keeps the fit snug and flexible through every position on the bike. It's a base layer built to be forgotten about once you're moving, which is exactly the point.