Human: What's the difference between a sombrero and a hat? Assistant: 
The main difference between a sombrero and a hat is that a sombrero typically has a brim, which can be up to 4 feet wide. A hat, on the other hand, usually has a smaller brim, generally no more than 2 feet in diameter. Additionally, a sombrero typically has a crown made of thick felt or straw, while a hat is often made from thicker material like wool or cotton.