The CEP Men's Progressive Night Calf Sleeves 2. 0 provide compressive support to key muscles groups as you run, and they also bring bright, funky colors and a moisture wicking nylon spandex blend to your legs. These calf sleeves increase blood flow and combat soreness post run, helping you recover after extended trail runs and races. Silver ions are embedded into the fabric itself to prevent funky odors. And as a bonus, these calf sleeves feature reflective hits for visibility when you run late at night.