Travel Dough® + Z™ Gel Parent Z™ Gel captures and distributes heat. Dough® formula creates a softer,, more supportive memory foam. Compressible design allows for convenient travel or use as a neck roll pillow. Convenient size can be used as a traditional sleeping pillow. Rayon from bamboo velour removable cover. . . . Z™ Gel captures and distributes heat Dough® formula creates a softer,, more supportive memory foam Compressible design allows for convenient travel or use as a neck roll pillow Convenient size can be used as a traditional sleeping pillow Rayon from bamboo velour removable cover