Sizing: Fits small; purchase ½ size larger than standard running shoe lengthHeel: Medium to narrowMid-foot: Medium to low volumeForefoot: MediumToe-Box height: LowArch Structure: MediumShoe Shape: Semi-Curved The La Sportiva Helios 2.0 SR add extra sticky rubber to the popular Helios 2.0. With its light weight and superb traction, this shoe is best for running uphill quickly over rocky terrain.