system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: how does the crisping sleeve work when microwaving something.
gpt
You know how the inside of the sleeve has a silver lining? It's basically a metallic film (called a "susceptor") that very effectively absorbs the microwaves and radiates heat. So, it gets very hot and can effectively brown/cook the food next to it with thermal radiation.