Engineered Mesh Upper Material improves airflow to help your feet keep cool; FF BLAST PLUS Cushioning provides lightweight impact absorption and a responsive rebound; FF LEAP Foam Technology is super lightweight and bouncy; Trampoline-Inspired Outsole design provides a more responsive bounce back; ASICSGRIP Outsole Rubber provides advanced grip for various terrains; AHAR LO Outsole Rubber creates better traction, improved softness, and advanced durability; Total Stack: 38.5 - 46.5 mm; Heel Drop: 8mm; Weight: 239 g/8.4 oz