Here's the tekky stuff from ASICS:

IMPACT GUIDANCE SYSTEM (IGS) - ASICS Design Philosophy. Employs linked compentry that enhances the foots natural gait from heel strike to toe-off.

REARFOOT AND FOREFOOT GEL CUSHIONING SYSTEMS - Attenuates shock during impact and toe-off phases and allows movement in multiple planes as the foot transitions through the gait cycle.

GUIDANCE LINE - Vertical flex groove decouples the tooling along the line of progression for enhanced gait efficiency.

COMFORDRY SOCKLINER - Provides cushioning performance and anti-microbial properties for a cooler drier healthier environment.

DUOMAX SUPPORT SYSTEM - A dual density midsole system positioned to enhance support and stability positioned sport specifically.

SOLYTE MIDSOLE MATERIAL - A lighter weight midsole compound than the ASICS standard EVA and SpEVA. Also features enhanced cushioning and durability.

GENDER SPECIFIC SPACE TRUSSTIC SYSTEM - Recognises the normal periodic changes in the shape of the womans arch and provides for the controlled deformation of the arch into the space within the system.