Advantages and benefits of wearing BLITZU Compression Calf Sleeves, Hikers, Walkers, ramblers, runners and joggers. Spend your whole day walking and running without muscle strains, cramps, and fatigues. Outdoor enthusiasts and Athletes. Less muscle strain means you can train harder, feel stronger and perform better in the gym and on the field. Jobs that involve lots of standing. Bring more energy into your legs! No more foot pain from standing all day long at work! Air Travelers. Our Sleeves help reduce pain by improving blood flow in the legs. People with leg problems. Prevent and reduce symptoms of Shin Splints, Calf Cramps, and Pulled Muscles. Features, AVOID INJURY Improve blood circulation. Prevent unnecessary injury and pain by offering optimal muscle support during everyday activities. SPEED UP RECOVERY The compression helps relieve muscle pain as well as aids in muscle recovery and rehabilitation. WARMING EFFECT Support full motion flexibility and Warm up your calf effectively. COMFORTABLE Ergonomically designed for full range of motion and superior comfort. Size Chart Important! Measure the thickest, fullest part of your calf (circumference) to determine the size. Calf Size Measurements S/M: 10" - 14.5" L/XL: 15" - 18.5" XXL: 18.5" - 22"