The World’s Strongest Sock (Design)! Make every day an adventure with the special edition Pippi Longstocking kid’s sock. Don’t be surprised if your 9-year-old become best friends with a horse and a monkey, defeats a band of pirates, or buys their own house. All Pippi Longstocking products are made from organic cotton. By purchasing this product, you support Pippi of Today, an initiative from The Astrid Lindgren Company in partnership with Save the Children: pippioftoday.com