Rubber sole Shaft measures approximately Ankle Strap from arch Nike sports shoe Soft tongue and collar for maximum comfort Cushioning from the heel to the tip The Nike Air Zoom Structure 24 is built for life in motion. It features soft cushioning and a unique textured design that improves both fit and comfort when you travel many miles. The newly designed, ventilated upper is based on data from runners and uses innovative mesh in key areas that improves cooling where you need it most.