Originally introduced in ASICS Performance Running products, FF BLAST™ PLUS ECO foam has been redesigned for tennis and strategically placed under the heel, where players need it most, providing excellent comfort during play. This material incorporates approximately 24% biological content, combining performance and sustainability. DYNAWALL™ technology now extends from the outside of the foot to wrap around the heel, offering greater stability and lateral support without sacrificing comfort. The new DYNALACING™ system allows the wearer to find the perfect fit and easily adjust the fit around the foot for increased comfort and flexibility, whether they need extra support or more room.