The Asics Gel-Nimbus 16 Trainers feature an updated Guidance Trusstic System to offer an incredibly smooth transition to the plush FluidRide midsole. With a fully customised fit of the FluidFit upper construction it's constructed from stretch mesh with stretch reinforcements to adapt to the runner's foot for a form-fitting glove like fit. Designed for underpronators to mild overpronators the Gel-Nimbus 16 Trainers cushions during impact and toe-off phases. - A.D. FluidFit - Asics FluidFit upper technology combines multi-directional stretch mesh with stretch reinforcements that adapt to the athlete's foot creating a truly customized glove-like fit. FluidRide - The latest evolution in Asics midsole technology Asics new Fluidride provides the ultimate combination of 20% more bounce back with a 15% weight reduction. 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 Trusstic System - This Trusstic System integrates Guidance Line construction for enhanced gait efficiency while providing midfoot structural integrity. Guidance Line - Vertical flex groove decouples the tooling along the line of progression for enhanced gait efficiency. Heel Clutching System - Exoskeletal heel counter provides improved support and creates improved heel fitting environment. Discrete Eyelets - Independently placed eyelets disburse lace tension creating a customised fitting environment and enhanced upper comfort. Weight - 11.4 oz Heel height - 23 mm Forefoot height - 13 mm