SEI Certified to meet NOCSAE standard. The MVP1000 Leage Series catching helmet is a great choice for younger players (T-Ball through introductory leagues) and those with smaller head sizes. The main shell is similar shape to a batting helmet and the cage is secured with elastic straps which make this helmet very comfortable and very easy to put on and remove. Designed to fit smaller heads, the MVP1000 can fit head sizes ranging from 6 1/8 through 7 1/4. Adjustable tensioning system provides secure fit. The dual density foam liner is made up of a firm layer of foam for absorbing and dispersing impacts followed by a second softer layer which is moisture wicking, comfortable, and fast drying.