This is a one size fits all plastic helmet. The inside headband can be fitted to your head. This helmet is sturdy and built to last. Grommets on each side of the helmet hold the veil in place without any creeping up the helmet. The front strap is for the beekeeper that wants a snug fit. The strap can be moved to under the chin to create a snug fit. A total of four vent holes allow limited ventilation.