NWT SMOKE FREE FAST SHIPPING BUNDLE TO SAVE H 1/5/2024 Fabric Content: Our compression performance socks use 40% Premium Peruvian Baby Alpaca Fiber, 33% Stretch Nylon, 20% Polyester and 7% Spandex. Product Details: With 15-20 mmHg of pressure, Hollow compression socks provide support and offer relief from achy, swollen legs and feet. Hollow compression socks make the perfect aid for enhanced circulation. Made in USA: Designed in Wisconsin by outdoor enthusiasts and made in North Carolina.