Angora wool is the lightest of all natural fibers - the hollow structure of the fibers makes it ideal for thermal clothing. Angora warmers allow the skin to breath, absorb moisture, and maintain a steady temperature at the skin surface for all-day wearing comfort. Angora warming effects relieve cold, chills, and discomfort from Arthritis. For men and women. Features & Benefits - Arthritis Relief with lightweight, natural insulation; 7 times warmer than wool; Helps maintain a steady temperature at the skin surface; Breathable, absorbs moisture, comfortable to wear; Latex free. Colors & Sizes - Natural White; Small (knee 14.5-16.0 inches), Medium (knee 16.0-18.0 inches), Large (knee 18.0-19.5 inches), X-large (knee 19.5-21.0 inches). Measure around bend of knee.