O’Neill Toddler Wetsuit Sizing O’Neill Kids Wetsuit Sizing Ride the waves like a pro in this rad O’Neill® Kids rash tee. Quick-drying and flexible fabric blend provides for an exceptional wear. Mock collar. Long sleeves. O’Neill brand markings at chest, left sleeve, and beneath back collar. Straight hem. 89% polyester, 11% elastane. Hand wash cold, drip dry. Imported. Measurements: Length: 21 1⁄2 in Product measurements were taken using size 10 (Big Kids). Please note that measurements may vary by size. If you’re not fully satisfied with your purchase, you are welcome to return any unworn and unwashed items with tags intact and original packaging included.