The Sockwell Elevation Men's Bark 20-30mmHG sock features Graduated Compression leg. The ultra light cushioned sock provides comfort and has a non-abrasive seamless toe closure. It embraces spandex throughout the sock and has turn welt top and arch support. It includes 31% merino wool, 31% bamboo rayon, 30% stretch nylon and 8% spandex. Size medium/large fits a mens 7 to 10 and a size large/XL fits mens size 10½ to 13.