Dr Comfort Shape to Fit Quarter length Ankle SocksAnkle length socks designed to reduce fatigue and aches, prevent circulation problems and protect lower feet and lower legs. Dr. Comfort Socks adjust for moisture, release Anions and restrain microbial growth. Another great benefit of Nano Bamboo Charcoal Fiber (NBCF) is its ability to regulate skin temperature, keeping your feet cooler in the summer and warmer in the winter. NBCF is also environment friendly, as no chemicals are required for this