Our Softest Insert Ever Is Back In BlackOdyssey DFX Putters are engineered with our softest insert technology ever to help improve your putting. The DFX insert is actually softer than our legendary White Hot insert for golfers who want smooth feel and roll on the greens. This putter performs, it’s available in some of our most legendary models, and it looks great with a premium all-black head design from the body to the insert.