This mask is well-made, reliable, and will protect you regardless of the situation. The lining features with patented moisture wicking fabric composed with differentials such as anti-bacteria, anti-odor, improved breathability and better blood circulation. The Bib is the perfect length, not too long to cover your whole shoulders and not to short to the point where it will not protect you. The head and chin pads are also quite confortable and allow for a nice snug fit. To figure our your size you must measure around your head with a piece of string or soft tape measurer. You must measure starting from the top of your head and wrap it around to under the chin.