This is our most popular model measuring 20"x32" made with 6 1/2 lbs of crystalline combining 50% amethyst and 50% tourmaline for the best both crystals have to offer. Internal temperature reaches 158 degrees but can be set between 70-158. Controller allows for timed shut off to 1,4, 8 or 12 hrs. Mat comes with its own waterproof carrier and a 2 year warranty.