Combining all of the best features of their top-selling ear headgear, the Cliff Keen Fusion delivers some of the best comfort and protection on the market. Its uniquely engineered 3-strap design is the reason for its exceptionally comfortable and secure fit. The EF66 Fusion also cleans easily, simply wipe with soap and water, or even anti-bacterial wipes. Chin strap pad included. One size but can be adjusted to also fit youth sizes.