Our Cozy Blend Sherpa Lined Crew Sock features thick sherpa-style lining inside an already warm and cozy sock. So cute you'll want to show them off, but ideal for heavy boots in "sub-zero like" temperatures. Crew length Warm sock lined with toasty sherpa-style faux sheepskin Acrylic blend is warm for colder temperatures Keeps feet toasty and comfy all day!