From ASICS, the Women's Novablast 5 ATC Reflective Stacked Running Sneakers feature: Breathable engineered mesh upper: At least 75% of the shoe’s main upper material is made with recycled materials to reduce waste and carbon emissions Tongue wing construction: Added stretch helps improve the fit while reducing tongue movement Reflective details designed to help improve visibility in low-light settings Lace up closure FF BLAST™ MAX cushioning helps provide a lightweight and energetic ride The sockliner is produced with the solution dyeing process that reduces water usage by approximately 33% and carbon emissions by approximately 45% compared to the conventional dyeing technology Trampoline-inspired outsole design: Helps provide a more responsive bounce back AHAR™ LO rubber outsole helps create better traction, improved softness, and advanced durability Approx. 8mm drop Approx. 32.5mm-40.5mm stack height Approx. 7.9 oz. weight Imported.