The Olympus Single mouth guard is made of a layer of vinyl that is permissible for oral hygiene. It is semi-hard for proper protection and fit.

Fitting instructions: Fill a container with water. Bring the water to a boil. Remove the water from the heat source. Let the water cool for 45 seconds, then place the mouth guard in the water for 90 seconds. Do not exceed the heating time. Carefully remove the mouth guard from the hot water with a spoon. Cool the mouth guard under a faucet for one second to make it comfortable to wear. Proceed directly to step 4. Carefully place the mouth guard on the upper teeth. Bite firmly, suck strongly, and use your fingers to press the edges of the mouth guard against the teeth and gums through the lips and cheeks (continue for 20 seconds).