What pillow is best for side sleepers?

Side sleepers need a thicker, firmer pillow (high loft) to fill the gap between the shoulder and head, keeping the spine aligned. Adjustable shredded foam pillows (like Coop Home Goods) are ideal because you can add fill until the loft matches your shoulder width. Solid memory foam with a contour shape also works well. Avoid soft, flat pillows they let your head drop and strain your neck.