Use Code “BLACKFRIDAY22” at checkout to get 20% off IFAST and XFAST Pairs. Sale runs 11.23-11.29

Find Your IFAST® Size

Our IFAST sizes are carefully aligned with US shoe sizes. However, taking into account your ankle and arch circumference can potentially result in a more accurate size recommendation personalized to you. Use this sizing calculator to get more accurate sizing than is possible by selecting a size based on only your shoe size.

Note: At the moment, we don't offer youth-specific sizing.