The Turtleneck Is A Winter Classic For A Reason. Warm And Versatile, It Offers Neck Protection And Helps Prevent Chafing From High Jacket Collars In Stiff Winds. Ours Is Delivered In A Soft, Lightweight Merino Wool Blend That Resists Odors And Wicks Sweat As You Heat Up Over The Run. Thumb Holes Add Versatility On Colder Days