Amazing sock, truly top quality. I have bought countless socks to finally settle on this one. It has the magical combination of wool for warmth, temperature regulation and antibacterial protection, polypropylene which is the most hydrophobic material and wicks away moisture but also offers durability, and elastane for a good fit. The bottom part is terry knit to be soft and warmer, while the top, as you will see, is thin so they fit in shoes and allow the foot to breathe better. They don't smell at all thanks to the wool, they don't cause blisters because the sock doesn't get soaked with sweat like cotton ones do... generally, for the army, hiking, or even everyday use, they are top notch.