The VKTRY Performance Insole is the first-ever sports insole designed to return the energy an athlete generates as explosive power, speed and agility. The VK’s patented carbon fiber design is scientifically proven to increase explosiveness by an average of +9.3%. Sports Medicine experts agree that VKs also provide added support, stability and shock absorption to help protect against injuries such as plantar fasciitis, turf toe, stress fractures, shin splints, etc. See why athletes at over 150 Pro and NCAA teams wear VKTRY Insoles and try risk-free for 30 days.