SmartWool makes machine-washable, non-itchy wool socks that provide natural moisture management. These walking designs are woven for comfort where walkers need it most. You don&#39;t need a liner sock with SmartWool socks, just wear them like any other sock and feel the natural comfort of itchless wool. I found they insulated great, without added thickness, for temps down to freezing.<p>Balega makes my favorite tech socks. They have both crew and quarter length socks in a blend of merino wool and technical moisture-management fibers. They also have a Merino Hidden Comfort sock with superfine knit for those who want thinner sock.</p>The old-school technique was to wear a liner sock of wicking polyester acrylic and an outer sock of wool. Wrightsock puts that together in one double layer sock that is no more thick than a regular pair of socks. These are well-designed to stay in place and provide a nice amount of insulation for temperatures close to freezing.<p>Designed for walkers, these socks use a Thor-Lon and merino wool blend to wick sweat from your foot and prevent blisters. The padding is placed just where needed - instep, heel, and the ball of the foot. Thorlos wear like iron, you&#39;ll have these for years to come. They may be thicker than your regular walking socks, so try them out with your walking shoes.</p>Teko makes environmentally friendly socks. Their organic tekoMerino wool comes from organic sustainable farms in Argentina. They use an ozone process rather than chlorine to make their wool non-shrinking. The polyester used in their blends is recycled. The socks are well-engineered for walking and hiking, but I find the fit a bit narrow and the wool a bit itchy.