I wore this twice because it’s a great weight/fit, but I am not a fan of the texture. No flaws. This is the prior 100% merino wool version. Waffles Before, During & After Runners believe in establishing a strong base. That emphasis on building from the inside out carries over to our layering strategy: It all starts with a warm and wicking foundation. The waffle pattern on this 100% Merino wool base layer traps air against the skin to increase insulation, while also allowing heat to escape as the effort increases. We introduced this top as part of our No Days Off collection but it proved so good, we've made it a staple of our cold weather collections. 100% Merino Wool Waffle Knit Base Layer Quick Drying, Odor Resistant A Better Layer Merino is an ideal insulating material for a base layer thanks to its natural versatility: it not only insulates, but also regulates temperature and wicks sweat. However, as the temperature dips a few tweaks can ensure better protection from the harshest elements. Our Waffle Layer uses 100% Merino in a waffle knit. The combination of the wool and this classic construction creates small pockets that trap warm air and hold it against the skin. At the same time, the waffle pattern allows excess heat to escape, regulating temperature over the run. Add in wool’s natural quick-dry and odor-resistant properties, and the result is a perfect cold-weather base layer.