1.Material: 75% Combed Cotton, 17% Stretch Nylon, 8% Spandex,Dri-FIT fabric helps keep you dry and comfortable. 2.Size:One size, Fit for US Size 6.5-11.5; Have a little Elastic.Not too tight, nor slip-off, enable good blood circulation 3.Reinforced heels protect your feet from scratches ,Multi-density fabric helps cushion impact. Deep heel cup keeps socks from sliding down, perfect fit your foot . 4.High performance socks use cool max fabric to wick sweat away and resist odors, keep your feet dry and cool all the time, for health. help you avoid blisters during your hiking,running or other outdoor sports. 5.YOUR BEST CHOICE – Ideal for Hiking, Camping, Mountain Biking, Trail Running, Backpacking, Travel, Trekking and Other Athletic Outdoor Activities and Wide Variety of Winter Sports.