Sizing Extra small - 0 - 3 mths (3-5kg) Small - 3-6 mths (5-11kg) Medium - 6-12 mths (10-14kg) Large - 12 - 24 mths+ (over 12kg) Features at a glance Sun safe upf 50+ High-quality nylon/spandex fabric Full-length zipper so you don't have to take the vest off over your babies head Zipper protection tab to avoid any discomfort from the zipper pull Chlorine treated to help increase longevity Learn more about our rash vest Our baby rash vests feature a full-length zipper which makes dressing and undressing baby, especially when wet, so easy. Our beautiful, high-quality rashies are chlorine-treated and rated upf 50+ with long sleeves your bubby is going to not only be protected from our harsh sun but will be the fashionista of the pool as well!