pack of 3 Wellow compression socks. XL New. Wellow socks fit a wide range of calf sizes. For a size XL the sweet spot is 18-22” calf. Feel good any day with Wellow. At 18-25 mmHg, our socks gently wrap around feet, ankles, and legs to provide the support that stimulates circulation without feeling tight. We call that the WellowFit. Our socks also provide unparalleled softness, durability, moisture-wicking, and antimicrobial properties. So your feet feel good, look good, and smell good.