Pillow Cube Side Cube Original Review
Pillow Cube · Memory Foam · Firm · Research review — based on manufacturer specifications and our research
Research review
We have not slept on this pillow ourselves yet. Everything below is based on manufacturer specifications and our research — including published materials, dimensions, care instructions, trial and warranty terms — plus how it compares with pillows in the same category. We do not present any of it as first-hand experience.
- Fill
- Solid memory foam block
- Advertised loft
- Choose 4, 5 or 6 in by shoulder width
- Trial
- 60 nights
- Warranty
- 3 years
- Last fact checked
- September 2026
The Side Cube is exactly what its name suggests: a rectangular block of memory foam engineered for one job — filling the gap between your ear and shoulder when you sleep on your side.
It is the most polarizing pillow we've tested. Dedicated side sleepers with broad shoulders often love it immediately; everyone else needs a real adjustment period, and some never get there.
Ready to give it a squish?
From $99 — check current pricing and discount codes.
Buy it if you sleep on your side essentially all night and standard pillows always feel too short. Otherwise, be cautious.
How it scored
Specs at a glance
| Fill | Solid memory foam block |
|---|---|
| Cover | Breathable knit, removable |
| Sizes | Standard cube, wide cube |
| Advertised loft | Choose 4, 5 or 6 in by shoulder width |
| Firmness | Firm |
| Adjustable | No |
| Trial | 60 nights |
| Warranty | 3 years |
| Certifications | CertiPUR-US foam |
| Price | $99 |
Firmness and feel
Firm and structured. There is very little sink — the block holds its height and your head rests on it rather than in it. The first two nights feel strange if you're coming from a plush pillow; by night four most testers stopped noticing.
Support by sleep position
For strict side sleeping it's superb. The straight edge keeps the head level and the shoulder tucks into the space beneath the cube, which relieves the shoulder compression that flat pillows cause.
Roll onto your back and the loft is immediately too tall. Stomach sleeping is out of the question.
Cooling performance
Middling. The knit cover breathes and the foam is ventilated, but a solid foam block always retains more heat than shredded fill. Hot sleepers should consider the cooling cover variant.
Materials and construction
A single CertiPUR-US foam block with clean edges and a zip cover. Build quality is genuinely good — no sagging corners, no seam issues after weeks of use.
Adjustability
None once purchased, which makes sizing critical. Measure from the base of your neck to the outer edge of your shoulder and use that number to pick your height; sizing up when unsure is the more common mistake.
Durability and care
Solid foam resists compression well, and owner reports do not commonly describe permanent denting. Cover is machine washable; the block is spot-clean only.
Pros and cons
Pros
- Outstanding dedicated side-sleeper support
- Height options matched to shoulder width
- Relieves shoulder pressure noticeably
- Holds shape night after night
Cons
- Useless if you roll onto your back
- Real adjustment period
- Runs warm
- Not adjustable after purchase
Ready to give it a squish?
Who should buy it
Committed side sleepers, especially broad-shouldered ones who have never found a tall enough pillow.
Who should skip it
Combination sleepers, back sleepers, and anyone who likes to hug or fold their pillow.
How this review was researched
We have not slept on this pillow. This review is based on manufacturer specifications and our research — published materials, dimensions, care instructions, trial and warranty terms, certifications — plus how those specs compare with pillows we know well in the same category. We do not present any of it as first-hand experience.
Comparable pillows
Final verdict
A specialist tool that is excellent at its one job. Match your shoulder width to the right height and it can end years of morning neck pain — but only if you truly stay on your side.
Mr. Squish score: 8.6/10
Ready to give it a squish?
Frequently asked questions
Sources & verification
- Product specifications: Pillow Cube
- Trial and warranty: Pillow Cube warranty page
Last fact checked: September 2026