If you're on your feet all day or deal with tired, heavy, achy legs or mild swelling, these Therafirm compression stockings could be a lifesaver. They provide \moderate\ medical-grade compression, rated at 20-30mmHg at the ankle (that's the average pressure for a standard size). This graduated compression is tightest at your ankle and gets gradually lighter up the calf, which helps your circulation pump blood back up to your heart more efficiently. The open-toe design lets your toes breathe and is great for wearing with sandals or for comfort. They're made in the USA from a two-way stretch blend of nylon and spandex with a reinforced toe for durability. The comfort band at the top is soft and non-binding but stays put. They also use a special Micro-Cool process to wick away moisture, keeping your legs cooler and drier. They're machine washable (gentle cycle, cool water) and should be laid flat to dry. IMPORTANT: Compression wear needs to fit right to work and be safe. Please measure your ankle and calf carefully before ordering this 3X-Large size. If you have any medical conditions, always check with your doctor first. For many, they offer real relief and support.