Baseball/Softball Wide Base Slider Kneepad (Youth, Adult in 7 Colors) Mizuno Slider Kneepad Cotton/polyester/spandex blend. 3/8" neoprene panels. Contour design w/wide base fully protects front, side and lower knee. Youth & Adult Sizes. Used to protect the knee under the baseball pants or with shorts Used by both male and female players from Youth Little League, Pony & Travel Ball, to High School, College & Professionals.