Portable! Fits easily in your gym bag, backpack, or carry-on luggage. * EXTRA FIRM surface provides 36% firmer surface than the Original Density models, intended for experienced users with especially dense muscle tissue that doesn"t respond to normal massage pressure * Provides firm BUT FLEXIBLE surface to relieve muscular pain and tightness similar to the thumbs of a massage therapist * Stretches muscle and other soft tissues in multiple directions, breaking down "knots", increasing your flexibility, and relieving your pain. * Higher strength and tear resistance, wonderful feel, permanent retention of shape, guaranteed to outlast and outperform compared to any foam roller on the market.