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Our trainers recommended this brand to us for derby. I personally don't see how it will help since it's rather thin (and pricey), BUT you can talk with it, drink with it, and it's not going anywhere. I tend to play with my mouth guards, shifting them with my tongue, but it's staying put, which is GREAT! Not bad molding, just have to be careful and fast. I used a butter knife to get mine out of the water. Took a few times to mold it right, but It's ok. :D