Sizing: Standard running shoe lengthHeel: MediumMidfoot: Medium volumeForefoot: MediumToe-Box Height: Medium to lowArch Structure: MediumShoe Shape: Semi-Curved TheNike Zoom Structure 20 is a moderate support road running shoe that offers an ideal blend of cushioning and comfort. The shoe is a great option for training over any distance.*Runner’s World is a registered trademark of Rodale, Inc. All rights reserved.