The Concept 1 shoes are the first to be banned by the NBA in its 64-year history, based on a rule against ‘unfair competitive advantage’ that increases a player’s jumping ability.

That confirms Athlethic Propulsion Labs’ claims that their Loan’N’Launch technology, located to the front of the shoes, gives anyone an instant boost to their vertical leap.

The Concept 1 sell for $300, and prior to the ban had attracted the attention of many NBA players. They work by absorbing ground contact energy and releasing it prior to a jump through a complicated spring-based propulsion system.