This is a 100% brand new mouth guard with excellent quality Dual density structure, softer than other teeth protectors Heating snap-in design, more fit users¡¯ tooth form. Groove fit the surface of the teeth, convenient to keep breathing smoothly and does not affect the protective effect of teeth during strenuous exercise. The mouth guard can reach to rear molars, to provide complete protection. ideal for paratrooper, judo, grapple, free combat, ice hockey, rugby football, BJJ, baseball and Muay Thai etc. How to use: 1.Put it to cup of warm water (70¡æ to 80¡æ) till soft for about 10 seconds 2.If it is soft, insert it to your upper teeth in mouth 3.To memorize your mold of teeth, bite it 10~15 seconds 4.If it is fit to your teeth, clean it with water and use it 5.If it is not fit to your mouth, you can fix it again from step 1 Note: Setting the water temperature of 70-80 degrees is appropriate, soaking time should not exceed 10 seconds Material: 100% POE Size: Free Size (Approx. 2.24*2.09*0.83inch / 5.7*5.3*2.1cm) Style: Convertible Color: Clear/Blue/Red/ Black Package Included: 1 X mouth guard 1 X Plastic box