What is washi? Washi is a super cool use of manila hemp yarn, a natural material that is both light and sturdy with excellent water absorption and moisture-releasing properties. Washi itself is commonly used to make paper, so using it in a sock provides a crisp, refreshing feel. The craftsmanship used in the pile knit for this sock is something to admire; Rototo used a special knitting machine to achieve it. Washi paper, but make it socks. Nice.