I'm not sure if Batman would use the 100% polyester Batman Yellow Symbols Sleep Pants...but that is because he doesn't sleep for more than 15 minutes at a time and that's a fact! I don't think any of us are quite to that point so we can thoroughly enjoy the Batman Yellow Symbols Sleep Pants. What isn't there to love about a soft pair of drawstring sleepy-time pants with button fly and a whole ton of Bat-symbols? Exactly!