Signature Premium Sports Type 2 Mouthguard Teeth Shield Adults Feature 3 Clear Physical retention properties with Anti penetrative features. Type 2 Signature Mouthguards with features contain embedded reinforcements, guides and retention properties. These unique custom features in warm and fit technology are for increased safety and high retention (tight fit) using warm and fit adaption methods as well as custom fit techniques. Try our Type 2 + Features if you are participating in ball sports, stick sports or have had difficulty fitting other mouthguards. Sizing is best approximated using your age and an estimation of your average dentition (mouth) size. As a guide use the below suggestions for deciding which size is right for you. Typically, males have larger dentitions then women. Particularly throughout youth and teenage years. Adults with smaller than average dentitions or strong gag reflexes are encouraged to consider teen sizes for comfort. Ages 5-10 (Kids) Ages 9-12 (Youth) Ages 12-17 (Teen) Ages 17+ (Adult) Key Features: Feature 1 - Unique ripple strip assists redirecting forces from the impact zone.