A lot of components of scuba diving masks are made from silicone. Usually, dive goggles have a silicone skirt and straps. Some masks you can buy are quite expensive, so it's more than reasonable to question how long your mask will last. Silicone will usually not degrade or lose its softness or shape over time. Some situations can shorten the life of silicone though. First and foremost, UV rays will start to degrade silicone. Make sure that you don't leave your scuba goggles baking in the sun while you're on the beach or a boat. Store it in a dark place when not in use. Another issue can be that you encounter bugs that like to chew and nibble on silicone. It's rare, but it can happen. Again, you want to store your scuba diving mask in a dark and dry place that is secure from outside elements and where insects cannot get to. Lastly, do not store your mask when it's wet. Let it dry thoroughly to prevent mold from growing in a steamy environment. That's not a problem for the silicone, but a mold-infested mask might end up in the trash.