All day compression when you need it most! FITS ® compression socks provide 20-30 mmHg of medical grade compression. Easy to put on with no hassle in pulling around heel or up calf. Our patented Full Contact Fit ® hugs the contours of your foot and stays put so there are no loose socks to constantly have to pull up. Extra cushioning in the heel, toe and the arch. Over-the-calf length falls just below the knee. Full contact welt to avoid slippage. Sizing Four simple steps for the perfect fit. 1. Select your shoe size (Women’s or Men’s) 2. Measure your ankle circumference. 3. Measure calf circumference (at the widest point). 4. Choose your size sock. Expert Tip: If you’re in between sizes, decide if you would like the sock to feel a little more snug or slightly more relaxed. Then size up or down. Size Ankle (cm) Calf (cm) Small Regular: 16-22 Plus: 22.5-27 Regular: 26.5-36 Plus: 32.5-44 Medium Regular: 19.5-24 Plus: 23-30 Regular: 28-39.5 Plus: 35-46 Large Regular: 22.5-27 Plus: 26-33 Regular: 32.5-44 Plus: 36-48 XL Regular: 23-30 Plus: 28-36 Regular: 35-46 Plus: 40-50 XXL Regular: 26-33 Plus: 31-37 Regular: 36-48 Plus: 44-54 Don't know your ankle and calf measurements? Reference our standard size chart here .