Rothco's Anti-Microbial Compression Combat Boot Socks are made in the USA and fit over the calf with a blister resistant cushion sole. The socks feature 5% spandex for compression, 2.5% silver used for its antimicrobial properties, and 52.5% cotton 10% nylon for comfort. Meets DLA Specs: SPM1C1-09-R-0063