A “launch pad” in the ball of the foot – where most of the energy for a vertical jump originates – compresses to store energy then releases it as the athlete jumps. The shoes were tested at a US university by “two biomechanics PhDs, who specialize in vertical leap, [who] concluded that Athletic Propulsion Labs™ Concept 1 provided a STATISTICALLY SIGNIFICANT increase in vertical leap compared to a leading brand’s most expensive high performance basketball shoe.” The shoes were designed for serious playing by “ collegiate basketball players who understand the importance of feel, support, traction, durability, and overall performance.” The APL Concept1 shoes are available in black or white for $300.00.