Sticky mats are great for yoga, but they just don't provide enough cushion for many other forms of exercise. It is nice to have a little more padding between your spine and the hard floor when you are doing serious ab work or for your knees when exercising on all fours, or kneeling. For Pilates, I like to use this simple mat by Aeromat.
This 48 inch exercise mat is 1/2 inch thick to protect your bones. It is durable, lightweight and easy to clean with a damp cloth. Since it rolls up with ease you can store it easily. Plus, having a plush mat eliminates some excuses for not doing ab work!
You can purchase one for $10.39 from the Pilates Super Store.