The NEW Defeet Wooleator Pro features a flat toe seam and additional lycra throughout the sock, providing a closer fit. Like the original Wooleator, the Pro is a thin, low-bulk sock in USA Merino wool. The Wooleator Wool Blend versions also include Repreve® performance fiber, moisture-resistant, and naturally antibacterial. The Wooleator Pro is equally comfortable for 4-season cycling or casual wear.