These interlocking tiles are a solid tile, meaning they will not let water penetrate to the subfloor, making them perfect for dog kennels and doggie daycares. These gym tiles also feature a multi-nib backing which aids in reducing foot fatigue and impact from high impact exercises making them perfect for plyometric, P90X, and Insanity workouts. Since these gym mats are thicker than most of our rubber tiles, they do come with the option to add ramp edges to reduce the tripping hazard that is inherent with these tiles and are backed by a 5-year warranty. These rubber gym tiles also feature a hidden interlock system making them virtually seamless and are accented by faux grout lines for aesthetic appeal.