UGG Women's Black Rain Boot Tall Knit Pom Pom Socks. The socks are made of a cozy blend of acrylic, nylon, wool, and spandex to keep your feet warm and comfortable. The knitted pattern and pom pom details give a stylish touch to your rain boots. They are machine washable for easy care and feature thermal technology to keep your feet warm during chilly seasons. These versatile boot socks are perfect for travel, activewear, everyday wear, or casual outings. Size 5-10