About Omni-Shield: Omni-Shield delivers protection from the outdoors where you least expect it but need it most. This coated fabric resists all liquids below 76DEG C from absorbing into the yarns and staining the garment (without any effect on the feel of the material). The fabric itself will also dry 3-5 times faster than untreated fabric, without holding moisture like a conventional fabric, meaning it stays lighter even when its wet. Sizing Note: Columbia sizing does NOT align directly with child age. Please use the sizing chart for guidance (Red ´Sizing Guide´ button next to the product photo) The size typically (but not always) relates to traditional 50th percentile sizes, which many children now exceed.