Birkenstock Blue Footbed Casual (Sport), Medium Width, (33) Kids 2-2.5 Go to amazon.com Related posts Top 7 best birkenstock insoles blue 2022 FeatureSizing indicates a W for Wide, M for Medium and N for NarrowArch Support for Flat ShoesExcellent StabilityLong-term comfortMade in Germany DescriptionBirkenstock Blue Footbed Casual (Sport) footbed insoles provide firm support and are designed for flat-heeled casual shoes. These are made in Germany.