Ultimate Performance Advanced Insole With F3D The insole with F3D, 3mm Damper, is an advanced dampening foam insert, which dissipates up to 95% of the high-frequency shockwaves generated with every step, especially on hard surfaces, like road, pavement and hard trails. Light and thin in design, these advanced insoles with F3D 3mm damper prevent harmful vibrations which have been associated with micro-traumas of the soft tissue in the lower limbs and are a contributory factor to pain caused by common running injuries such as bruised heel pad, achilles tendonitis, compartment syndrome, shin splints and ITB syndrome. Shockwave reverberation which can often be caused by running can also cause neck and back pain, which is why the F3D technology has been added to specific areas for extra support for your feet. Ultimate Performance has included a PU foam through the core of the product. The insoles also have an advanced design TPU arch brace in order to produce stability and