What are the grooves for in the Miller lite bottle for?

cryst

New member
I haven't had a miller for a long while, while out at the store I purchased a six pack because my usual brand was out. I noticed that towards the top of the bottle are crisscrossed grooves, I am assuming it is to prevent foam to build while drinking, but to be honest I haven't a clue.

They look neat, sort of like bubbles at the top of the bottle.
 
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