This mouth guard is made of dual density structure， softer than other teeth protectors. Suitable for paratrooper， judo， grapple， free combat， ice hockey， rugby football， BJJ， baseball and Muay Thai etc. sports. Effectively protect your teeth from impact damage during motion. Features: Dual density structure， softer than other teeth protectors 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 Heating snap-in design， more fit users�� tooth form Suitable for paratrooper， judo， grapple， free combat， ice hockey， rugby football， BJJ， baseball and Muay Thai etc. sports. Effectively protect your teeth from impact damage during motion. Material: 100% POE Size: Free Size (Approx. 2.24*2.09*0.83inch / 5.7*5.3*2.1cm) Style: Convertible Color: Black? Usage: Put it to cup of warm water (70�� to 80��) till soft for about 10 seconds If it is soft， insert it to your upper teeth in mouth To memorize your mold of teeth， bite it 10~15 seconds If it is fit to your teeth， clean it with water and use it 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 Package Includes: 1 x Mouth Guard