The Barney Patrol Matted is our 100% woven natural straw sun hat. Dried straw is DELICATE and can be broken if bent or smashed. Straw hats are designed to protect you from the sun, but not from the water. Water on straw hats will cause the straw to bow, expand, and eventually break. Avoid putting it in the pool or ocean.The hat includes a chin strap tie that can be used to accommodate head size. The Barney Patrol comes in an infant/baby, toddler, or youth size. Our Barney Patrols are  true-to-size based on the child's age. What this means is the average sized kid--about 50% on the growth charts--is used as the barometer for head circumference. Unlike our traditional snapbacks the size isn't adjustable.If you have a child who's age fits evenly between the ranges (4months-12months, 12months-3 years, 3years-6years) or you know is larger than average, it might be best to size up rather than to size down.