A single layer can have a bigger impact than you think.
Mountain Hardwear Women's AirMesh Long Sleeve Crew - XL - Blue The sheer possibilities are endless. This layer may look unassuming, but once you have it on, you won't need anything else.Made with a unique active mesh, consisting of hollow, tube-like fibers with radial extensions that absorb sweat, quick-drying capabilities are at its highest, supporting insulation and heat-shielding properties to keep you cozy in the coldest conditions or even just at home, all while reducing weight by half compared to yarns of comparable thickness.