The zips we use are highly water resistant but they are not waterproof. Pockets internal and external may be susceptible to water ingress or condensation, remember this if you put your expensive gadgets in your pockets without additional protection such as a dry bag.
YKK Aquaguard zips (with a PU coating) are highly water resistant but not *waterproof*. These are used on the Balance, Pulsar and Parallax styles (also found on many high end waterproofs from other brands). The Gravitas uses a special water repellent zip which does not have a PU coating, which makes it lighter and more flexible but less resistant to water - it’s more like a DWR treatment. There is a storm flap behind the zip though, to add another layer of protection.