What is the difference between the 1/2" Mega Mat and the 1/2" Premium Mega Mat (which costs less than the item without the word "Premium" in its description)?

The main difference between our 1/2" Premium Mega Mats and our Mega Mats is that the premium version is vulcanized. This means that the mat is more durable and non-porous. So if you are using these mats over a plywood subfloor or on a second level, they will be able to absorb more of the impact. We recommend these mats for anyone doing any Olympic lifting. For anyone looking to do more high impact workouts, we recommend using our Mega Mats are easier on the joints as they are more shock absorbent in that respect.