Snapback Slim is composed of high quality woven elastic and flexible knitted elastic. I’ve been using my wallet for a while now and haven’t encountered any issues under normal use. As with any product, it’s normal for Snapback Slim to show signs of wear over time. Use as directed to extend the life of your wallet.
PS - I don’t recommend using Snapback Slim like this, but here’s quick video to show how durable/secure it is.