At about 375 degree I heard a weird noise, not quite a pop

It is a little heavy and that is super when you don't have to hear those cheaper sheets popping in the oven from the metal bending.

This stupid pan popped and warped after 2 minutes in a 290 degree oven the FIRST time I used it.

30 seconds after I put it in the oven I heard a pop and sure enough the pan had warped as soon as it heated up

Wilton is usually pretty good but these baking sheets are worse than my cheap-o grocery store ones