Please note! The tip is approximately 3.5" in width and MAY NOT BE SUITABLE FOR ALL BODY TYPES. Smaller frames may find it difficult to properly use the product. Please contact us if you have any issues using the product and we would be happy to provide additional instruction and assistance. The Hip-Fin is a product specifically designed to help lessen or eliminate pain in your lower back, hip, or lower leg by releasing tightness in your hip flexor muscles. A lot of pain in these common areas actually originates elsewhere in the body, but the pain itself is felt in your knee, or back, etc. This is known as referral pain, and your hip flexors are notorious for referring pain to other parts of your body. It is possible to have legitimate pain that is not referred from elsewhere, and thus require targeted treatment directly to the affected area such as the back or legs. Even in cases like these however, the hip flexors can play a huge role in eliminating that pain. The iliacus and psoas major muscles are some of the largest muscles in your body, and until now the only way to target them was by going to a physical therapist or massage therapist. Everyone suffers from tight hips. If you sit, run, workout (to name a few activities), your hip flexors are hard at work which means they are tightening up. Think of them as any other muscles in your body. If you do squats or deadlifts, your muscles get tight and you take action to loosen them up. Hips are exactly the same and although it used to be difficult to get relief, the Hip-Fin was designed to target both the iliacus and psoas major muscles anywhere you are! INCREASE MOBILITY: Your training goals and objectives are well rounded, your recovery tool should be too. Hip tightness is found in both the iliacus and psoas major muscles, therefore you must effectively target BOTH to lessen and eliminate your pain and increase your mobility. ENGINEERING IT: Over a year of engineering followed by prototyping to deliver the perfect design: the same shape and curvature of a sports ortho PT's hands, the ability to target two muscles, and the strength to support 100 pounds or 300 pounds...no trivial design here. 100% designed, engineered, and made in the USA. Patent No.: US 11,622,899 B2