Is the Original Pillow good for neck pain?

It is designed for it. The shredded fill lets you shape support under the neck, and many owners with neck stiffness report improvement. It is not a medical device, and sleepers who need firm, uniform support may prefer foam.

Can I adjust how thick it is?

Yes. The fill is loose inside the cover, so you can remove some to lower the loft or add it back to raise it. Shake it out and fluff it to keep the fill even.

Is it good for side sleepers?

Side sleepers generally need a taller pillow to fill the gap at the shoulder, and the adjustable fill suits that. Stomach sleepers should remove fill to keep the neck neutral.

How does it compare with a memory foam pillow?

It is softer and moldable rather than firm and slow-springing. Foam holds a fixed shape and does not need fluffing; this pillow lets you change its height but needs shaking out to keep its loft.

The pillow is machine-washable on a gentle cycle and can be tumble-dried low, though the fill takes time to dry fully. Check the care label before washing.