Sizing: Standard running shoe lengthHeel: MediumMid-foot: Medium to low volumeForefoot: MediumToe-Box height: Medium to lowArch Structure: Medium-highShoe Shape: Semi-Straight The HOKA ONE ONE Challenger ATR 3 is a highly cushioned, lightweight trail running shoe. Its versatile traction makes it suitable for a variety of terrain.*Runner’s World is a registered trademark of Rodale, Inc. All rights reserved.