pixllIt's a mix of both. There's a waterproofing finish on the fabric, as well as the fabric itself and seams being waterproof.
I would not put this in the washing machine; technical garments are better to just Febreeze and air-dry, or spot-clean when needed.
Please refer to garment care info the garment itself. Usually you can wash lightly in the washing machine and air-dry. Just be aware that you may wash some of the waterproofing finish away, and may need to reapply some on your own (there's plenty of waterproofing sprays for technical jackets under 10-15 bucks).