Something I’ve seen before in videos from movie sets, I saw again yesterday while watching Everyone is Lying to You for Money.
DogRat-approved Sony MDR-ZX110 headphones, often available for a measly ten bucks, seem to have become a new standard for audio monitoring in the field. You can buy ten or more pairs for what a pair of Sony MDR-7506 headphones costs.
https://www.amazon.com/dp/B00NJ2M43M
Standard Disclaimer: This is not a paid endorsement.