Asphalt shingles are the best roofing shingles in the U.S. Made to be strong and flexible compared to other roofing options, they are typically manufactured following this process:
Everything You Need to Know About Asphalt Shingle Blisters
Blister formation is a common problem on asphalt shingles. Rogers Roofing discusses its causes and the things that you and your roofer can do to minimize this issue.