Vitalsox Italy, Silver Drystat Tennis No Show Socks Fitted Pairs Fitting Chart Small Ladies 5-8 Men's 4-7 Medium Ladies 8-10 Men 7-9 Large Ladies 10-12 Men's 9-11 Extra Large Men's 11-14 Arch support starting mid foot for plantar ligament support Silver DryStat, slows the growth of fungus and bacteria reducing sock odor. Quick drying and wicking reduces moisture preventing blisters. Made in Italy using the latest technology and fibers, never outsourced to the lowest bidder Designed for tennis and lower leg wellness, popular for Walking, Running, Maternity, Yoga, Travel, Standing or Sitting and Sleeping