BIOguard I. A knee or ball to the face can mean serious injury to your head, neck, and jaw, so protect yourself with a Soccer Mouthguard from Sportsguard Mouthguards. Having the right mouthguard for Soccer is crucial for you to continue to perform at the top of your game. If Soccer is your sport‚ Sportsguard has the best mouthguard to fit your specific needs. All Sportsguard Mouthguards are scientifically designed to help protect you using our high performance, impact energy absorption PolyShok Technology with 150% more energy absorbent than other mouthguard materials. Custom Fit to Jaw 2 Layers of PolyShok. Thickness of 3 to 3.5mm Choice of TWO Colors. Choice of Text or Cool Design. (Text & Design Strapless ONLY).