ProSource High Density Extra Firm Foam Roller for Muscle Massage and Core Exercises FIRM MASSAGE - High density foam structure provides a deeper massage than standard foam rollers, and is firm enough to support all body types without losing shape after regular use COORDINATION  This versatile fitness tool offers an unstable environment for Pilates, core exercises, and improving coordination WORKOUT RECOVERY - Eases tightness in muscles after training for improved recovery and relaxation  a great addition to workout programs for beginners and advanced users LOW-MAINTENANCE - Made out of non-toxic, high-density expanded polypropylene (EPP) that is easy to clean; 36-inch by 6-inch size is suitable for anyone; smaller sizes are easy to store and great for travel