ASICS has studied the physics so you dont have to and can just step in and enjoy the limited-edition version of this runner. A FluidFit seamless upper features an Ortholite last and an X-40 sockliner for a custom fit. Heel clutching technology in the midsole is designed to improve heel fit while the Trusstic system reduces sole weight and maintains durability. The midsole also includes Solyte material for lightweight strength. ASICS High Abrasion Rubber (AHAR) to increase durability. Rear and Forefoot GEL Technology Cushioning Systems to reduce stress on impact. GEL cushioning also is guided by the Impact Guidance System. 12.80 oz.