Certified sleep science coaches · 35+ pillows tested
Most PopularPillow Cube
Pillow Cube Side Cube Pro
Cube-shaped pillow that fills the shoulder gap perfectly for side sleepers
Fill
Premium memory foam
Firmness
Medium-Firm
Trial Period
60 nights
Warranty
3 years
Free shipping
Our Ratings
Pillow Cube Side Cube Pro Overview
The Pillow Cube Side Cube Pro holds constant loft across its surface so a side sleeper's head does not sink into a lower spot overnight. It is excellent for dedicated side sleepers and wrong for combination sleepers.
Our Review
The Pillow Cube Pro takes a radically different approach — instead of a shoulder cutout, it uses a tall cube shape that perfectly fills the gap between your shoulder and head when side sleeping. Available in three heights to match your shoulder width. Over 4,000 reviews and viral social media popularity make it the most-talked-about side sleeper pillow.
Our Hands-On Experience
The cube shape is not a gimmick; it is an attempt to hold constant loft across the whole pillow so a side sleeper's head does not roll into a lower spot during the night. In testing it did exactly that — head position at 3am matched head position at bedtime more closely than with any conventional pillow.
It is strictly single-purpose. Roll onto your back and the height is immediately wrong, which is why combination sleepers in our group abandoned it within a week. Dedicated side sleepers were the opposite: several preferred it outright.
The memory foam runs medium-firm and warmer than latex. At $99, buy it only if you genuinely sleep on one side all night; if you switch positions, an adjustable-fill pillow like the Coop or Nest Easy Breather is the better tool.
What We Love
- Unique cube shape fills shoulder-to-head gap perfectly
- Three height options for different body types
- Premium memory foam construction
- 60-night trial period
- Viral popularity with 4,000+ reviews
Room for Improvement
- Unusual shape takes getting used to
- Not suitable for back or stomach sleeping
- Memory foam can sleep warm
- Smaller surface area than traditional pillows
Best For
Customer Reviews
Finally the right height
At 6'3 with broad shoulders, no pillow was ever tall enough. The 6-inch Cube Pro fills that gap perfectly. My neck is finally aligned.
How We Tested the Pillow Cube Side Cube Pro
Every pillow we review goes through our rigorous, multi-step evaluation process. Here's exactly how we arrived at our scores for the Pillow Cube Pillow Cube Side Cube Pro.
Multi-Position Testing
Each pillow is tested by panelists in side, back, and stomach sleeping positions. We measure loft, compression, and neck alignment across body types.
Loft & Support Mapping
We measure initial loft, compressed loft under a standardized head weight, and rebound time to quantify support consistency throughout the night.
Temperature Regulation
Surface temperature is tracked with thermal sensors over 6 hours to evaluate cooling claims and heat retention for different fill materials.
Shape Retention Testing
We simulate 6 months of use with 5,000 compression cycles and measure loft loss, clumping, and fill migration to project long-term performance.
Hypoallergenic & Value Review
We verify hypoallergenic claims, assess cover removability and washability, check certifications, and compare price-to-quality within the pillow category.
Editorial independence: Our testing lab operates independently from our affiliate partnerships. Brands cannot pay for higher scores or influence our methodology. Read our full editorial policy and detailed testing methodology.
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