Hollow Socks Mens M Gray Compression Wide Calf Alpaca Nylon Polyester Spandex. Brand: Hollow. Style: Men's wide-calf compression socks with 15-20 mmHg graduated support; moisture-wicking, temperature-regulating, antimicrobial and odor-resistant construction; breathable and super soft. Size on tag: M; Size type: Regular; Department: Men; Tag reads M. Color and pattern: Gray solid. Material and fabric: Baby alpaca wool blend with nylon, polyester and LYCRA spandex. Label variations pictured: MD - Compression Wide - Grey (54% Baby Alpaca Wool, 36% Nylon, 7% Polyester, 3% LYCRA spandex) and MD - Compression - Grey (47% Baby Alpaca Wool, 30% Nylon, 17% Polyester, 6% LYCRA spandex). Details and features: Wide-calf compression, graduated support (15-20 mmHg), moisture-wicking, temperature-regulating, super soft alpaca feel, breathable, antimicrobial and odor resistant. Branding and labels: Packaging label reads HOLLOW; size chart, care instructions, and fiber content sticker pictured. Codes and identifiers: MD - Compression Wide - Grey; MD - Compression - Grey; UPC: 850039701535; UPC: 850039701320. Country of origin and care: Made in the USA (with imported yarn); care instructions pictured: Wash cold, hang dry. Actual Measurements: US Men: 7 - 9.5, US Women: 7 - 10, Calf Circumference (Standard): 12 - 16 in, Calf Circumference (Wide): 16 - 20 in. Occasion and use: Winter performance socks suitable for hiking, walking, travel, and everyday casual wear.