RefrigiWear Warm Merino Wool Moisture Wicking 10-Inch Leather Boot Socks SIZING: Small/Medium (Men's shoe 7-10); Large/X-Large (Men's shoe 11-15) MOISTURE WICKING: Sock keeps feet warm while also drawing perspiration away to ensure dry, warm, comfortable feet MATERIAL: Combined Merino wool and stretch nylon materials help keep your feet warm while ensuring a comfortable fit REINFORCED TOE & HEEL: Reinforced toe and heel of sock ensures extra durability where you need it most ARCH & ANKLE BANDS: Provide extra support to enhance comfort in the places where your feet need it most THE BEST BOOT SOCK: 10" height makes socks perfect for wearing with boots, and provide additional comfort and warmth in cold weather