Although, we don"t recommend stretching your Adidas Yeezy Foam Runners, especially if you shop at The Vault as we offer easy size exchanges. If you have no choice we recommend using a hair dryer to heat the sneakers up for 30 seconds and then wearing them with two-three pairs of socks. This is quite unorthodox but does allow the sneakers to stretch due to their material. However, all our Yeezy Foam Runners are eligible for size exchanges.