Black Youth, Mizuno Baseball/Softball Slider Kneepad Maxiumum Knee Protection from Slide Abrasion/Bruises Mizuno "MzO" Baseball/Softball Slider Kneepad Maxiumum Knee Protection from Slide Abrasion/Bruises. Cotton/Polyester/Spandex Blend, 3/8" Neoprene Panels Contour Protection Design offering a wide base that fully protects the front, side and lower knee. Worn By Baseball & Softball Players of all Levels: Little League, Pony, ASA, Travel Ball, Babe Ruth, School, Rec. Leagues, Etc