What is the proper method to check the fit and retention security of a motorcycle helmet before riding?

1. Select a helmet one to two sizes larger than head circumference so it can be taken off effortlessly without unbuckling the chin strap
2. Fasten the chin strap loosely around the rider's neck to maximize breathing airflow while riding at high speeds
3. Ensure the helmet rotates freely 90 degrees around the head when turning the neck left and right
4. Ensure the helmet fits snugly with slight cheek compression, and adjust the chin strap so that no more than one or two fingers can slip between the strap and chin