Most people generally find that compression socks should feel snug but not too tight. You should be able to slip a finger under the fabric at the widest part of your calf without much resistance. If you can't do this, the socks are probably too tight and could cut off your circulation.

Flight socks, or compression stockings, should feel snug and supportive, but they should never be painfully tight. In 2026, medical experts emphasize that the goal is "graduated compression," where the pressure is strongest at the ankle and decreases as the sock moves up the leg to help pump blood back toward the heart. If your socks are so tight that they cause tingling, numbness, or skin discoloration (turning blue or pale), they are likely hindering your circulation rather than helping it. Conversely, if they are loose or bunching up, they won't provide the necessary pressure to prevent Deep Vein Thrombosis (DVT). A well-fitted flight sock should feel like a firm "hug" on your calves. It is critical to measure your legs correctly before purchasing to ensure you have the right size, as restricted blood flow from overly tight hosiery can lead to nerve damage or skin irritation during long-haul travel.