Exclusive! Psithurism: The sound of leaves whispering in the breeze. Now you know, and you can start tossing it around on walks in the park. "Just listen to that psithurism!" From the creator of the popular Facebook page Grandiloquent Word of the Day. Sport Gray sweatshirt is 50/50 cotton blend, T-shirt is preshrunk 90/10 cotton blend. Sizes S-3XL. Imported.