The Purple Harmony is great for back and side sleepers and is extremely breathable to help you sleep cool through the night! Is Purple Harmony a Good Pillow for You? If you’re a back sleeper, I think you’ll love the Purple Harmony pillow. I’m a back sleeper and I personally found it to be a great loft and firmness for keeping my head and neck aligned with my spine. Back sleepers should choose the low or medium loft version. If you’re a side sleeper, I also think you’ll find the Purple Harmony to be quite comfy. I’d opt for the medium or high loft version to ensure proper spinal alignment. If you’re a hot sleeper, the Purple Harmony should do a great job at keeping you cool and maintaining that "cool side of the pillow" feel - on both sides. Its latex core maintains a cool temperature naturally and the Purple Grid Hex and breathable cover allow for lots of airflow.