Each Crazy Aaron's Thinking Putty comes with its own special elements and effects that make it unique in the putty universe. We like to think of it as their putty personality. One of these elements is texture. Thinking Putty comes in 2 (or 3 - We're looking at you Crystal Clear) firmness levels, with soft being the most flexible or pliable. Best for free form play and stretching, soft texture Thinking Putty® will melt in your hands and return to its original shape faster than it's firm texture counterparts.