Elastic Slip-On Ankle Support Knit elastic slip-on style with open heel Available in S, M, L, and XL Indications: Provides intermediate support and compression for minor ankle injuries. Compression helps reduce inflammation. Application Instructions: Slip ankle through support so that heel fits snugly in the open hole. Sizing: Measure around widest part of ankle. Sizes: S (6"-8"), M (8"-11"), L (11"-13"), and XL (13"-16")