Kendall Jenner has given a great boost to Adidas' product line. Just four months after signing on to endorse the brand it has passed Air Jordan to become the No. 2 selling sneaker brand in the U.S., according to NPD Group. Adidas' saw sales and its market share skyrocket up 50 percent in the month of August. The growth stems from Jenner modeling Stan Smith and Superstar kicks on her social media profiles, including Instagram and Twitter, which boast over 100M followers .