This adult, one-size-fits-most snorkel combo mask has a hypoallergenic silicone face skirt for ultimate comfort. The face skirt forms a tight seal to prevent water leaking into the mask. The three-way adjustable buckles deliver a custom fit for any user. The one-way purge valve makes for easy clearing when in use. An ergonomic mouthpiece on the snorkel prevents jaw fatigue. One size fits most.