The new "Cliff Keen Signature" 4-strap foam headgear is based on the revolutionary design of the original E41, patented by Cliff Keen nearly 50 years ago. The "Signature" vnf foam offers the same features that made it the best-selling ear protection for all time: Lightweight, very comfortable fit and greatly reduces friction on the mat. Fully adjustable. SP94 chin strap pad included. Individually adjustable, including children's sizes.