Our hard/firm foam rollers are made from supportive and high-quality foam, and our deep groove also provides the comfort and stability to fine-tune the vertebrae of the spine. All of our foam rollers are made from the same high-quality foam. We recommend starting with the light blue soft density, then graduating to the orange medium density before fine-tuning with our maroon hard/firm density foam rollers. Unlike other foam rollers that sag, curve, or break down over time, all of our foam rollers are made from high-quality foam that maintains its shape.