Mouthpiece for sports such as martial arts, comes with a case. Provides significant benefits such as tooth protection and improved athletic performance. [Material] EVA (Ethylene Vinyl Acetate, Thermoplastic Polymer) that meets safety standards. [How to Use] 1. Soften the mouthguard by immersing it in hot water of about 70°C. 2. Place it in your mouth and gently bite down on the mouthguard with your upper and lower teeth (do not bite too deeply), adjusting it to the proper position in your mouth for 30 seconds. 3. After the mouthguard is firmly in place, mold it completely for about 10 seconds, then cool it with cold water. *If it does not fit well, repeat the steps to achieve a perfect fit. *Before use, please check if the size is appropriate. If the size is slightly off, you can trim it to fit your teeth line. *We have many other items for sale. Please search for the shop name "OK-SHOP".