No. Vivo S1 is not a waterproof mobile phone. However, plenty of covers available for the mobile which can protect from sudden water splash.
No. Vivo S1 does not have a hybrid sim slot. The mobile has a dedicated MicroSD card slot. You can use a memory card of up to 256GB.
Yes, Vivo S1 does have the Corning Gorilla Glass 5.
Vivo S1 has a weight of 179 grams.