Shock Doctor Basketball Mouth Guard, Youth & Adult Sizes Bio-fit design for ultimate ease of speaking and breathing during high levels of Basketball activity Gel-fit liner custom molds to teeth for a tight, comfortable fit that helps keep mouthguard in place Form-fit chassis unique bio-mechanical designed shape to fit the natural Dimensions of every Tooth Lower molar integration gel window provide upper and lower jaw molar interlock when clenched for added protection New low-temp easy fit process easy, no-boil fitting allows for highly customized fit