Sidelines Makura Antimicrobial Mouthguard Case has been engineered with an innovative, safe, and incredibly effective anti-microbial agent. It boasts superior heat and light resistance compared to traditional organic anti-microbial compounds and has been tested to protect against over 200 different types of contaminants. Hygienic Protection: Suitable for use with the full range of Makura mouthguards. Anti-Microbial: Destroys up to 99.9% of harmful bacteria.