Ideal for cold-weather conditions, the Ultimate Hunting System combines the Hunting Light Crew and the Liner Crew. Both are made using WOW Technology in the reinforced sole for premium comfort and durability. SmartWool Fit System offers arch and ankle support for greater comfort. Flat-knit toe seam ensures long-wearing comfort. Hunting Light Crew: 73% wool, 26% nylon, 1% elastane fabric. Liner Crew: 64% wool, 34% nylon, 2% elastane fabric. Made in the USA of New Zealand Zque Merino wool. Men's Sizes: S (3 - 5.5), M (6 - 8.5), L (9 - 11.5), XL (12 - 14.5).