Retrospec Relief FR 18″ & 36″ High-Density EPP Extra Firm Round Foam Roller for Exercise, Massage Yoga, Pilates and Post Workout Muscle Recovery $21.99 – $39.98 Make sure this fits by entering your model number. Extra-firm, high-density foam maintains shape, even with frequent use. Retrospect foam roller applies a low-intensity force to soft tissue, relieving any lingering soreness and increases recovery time. Ideal for improving mobility, flexibility, and preventing muscle soreness.