Premium Bamboo Fiber: 83% Rayon from Bamboo, 15% Polyester, 1% Spandex, 1% Elastic.MOISTURE WICKING: Bamboo fibers have a hollow structure, making them super-absorbent and breathable, to keep feet stay comfortably fresh.ORDOR CONTROL: Bamboo fiber has the property of anti-odor and avoids fungal infections for sweaty smelly feet, which keeps your feet odor free.EXTRA FULL CUSHION: Super soft towel-feeling cushion around your whole foot to provide the perfect amount of support, absorbs impact and protect your arch and ankle from injury due to shoes friction, which avoid blisters during your hiking, running or other outdoor sports.REINFORCED HEEL: Reinforcement in heel provide durability in high stress areas to dramatically in improve bamboo ankle socks' life.HIDDEN SEAM TOE: +MD unique hiding seam toe design do the best to make your toe release from any discomfort or irritation.FOR ALL SEASONS: Premium Bamboo fabric allows air to circulate. Thermo-regulating keeps your feet cool during the warm months and helps maintain the heat during the cold days.LONG LASTING: They may look smaller generally, but they are super stretchable. Bamboo fiber will be much softer after the first wash. We suggest you wash them before you put them on. The fabric is durable and sustains its softness even through multiple washes.