Looking for a tea with a low amount of caffeine, maybe white tea is your best choice. 

Does white tea have caffeine?

Yes, white tea has caffeine as well. However, not as much as green tea and black tea. Black tea is measured to hold about 40mg/serving, green 20mg/serving and white 15mg/serving. If you’re a regular coffee drinker, you’d like to know that black coffee contains about 120 to 150mg caffeine per serving.
Besides all the other benefits of white tea, the relatively low amount of caffeine makes this tea a perfect drink for people who'd like to lower their daily caffeine intake and as well an ideal (summer) evening drink.
 

Check the catalog for more information about White Tea.