Not sure what size to order? Use the charts below to find your perfect fit for Nammu UPF 50+ swim hats and swim shirts — available for kids and adults. Need help? Contact us and we’ll guide you.

XS

17.5″ / 44.5 cm

————————————
Best fit for babies and toddlers

S

20″ / 49 cm

————————————
Available in reversible hats only

One Size

Up to 21.5″ / 54.6 cm

————————————
Fits kids of all ages and most adults

XL

21.5″+ / 59.7 cm+

————————————
Best fit for above-average head size

1. Grab a flexible tape measure — or use a piece of string, then lay it against a ruler.
2. Wrap it around your head just above your ears, angling slightly upward across your forehead.
3. Note the measurement in inches or cm, then match it to the size cards above.

1. Measure your body length from the top of your shoulder straight down to where you want the shirt to end.
2. Measure your chest around the fullest part, arms slightly lifted. For best results, measure without a shirt.
3. Measure your sleeve from the top of your shoulder along the outside of your arm to your wrist, with your arm slightly bent.

• All measurements are of the garment laid flat — double the chest for full circumference