You need a calf support that is comfortable, not cumbersome while maintaining flexibility This highly breathable Neotech Care calf support is perfect for all day use when more flexibility or comfort is needed. The supports utilize a SPECIAL KNITTING COMPRESSION TECHNOLOGY to provide extra compression support to the calf region without increg the feeling of thightness. This calf sleeve is ideal for everyone. It is breathable, comfortable, light weight and it can be worn discreetly underneath clothing. SIZES Legs standing naturally. Measuring the middle of your calf circumference. S: 26-35cm (10.25-13.75) M: 34-42cm (13.5-16.5) L: 41-48cm (16.25-19) XL : 47-53cm (18.5-20.75) Measurements can vary sligthly depending on measurement method: +/- 0.5cm (+/-0.25inch) Please also keep in mind when choosing the size that the fabric is stretchable.