Pillow Cube Pillow Reviews

Square-edged pillows built for one position

Pillow Cube built an entire brand on a single geometric argument: a side sleeper's head and shoulder form a right angle, so the pillow filling that gap should be a rectangle rather than a squashy oval. It is a genuinely useful idea for dedicated side sleepers with broad shoulders, and a genuinely bad one for anyone who rolls onto their back. Sizing is the whole game here — the loft is fixed, so measuring shoulder width before ordering matters more than with any other brand we cover.

These are research picks based on manufacturer specifications and our research, not hands-on testing. See how we test pillows

What Pillow Cube does well

The square profile fills the shoulder gap better than a traditional pillow
Firm edge support that does not collapse under a heavy head
Clear sizing guidance tied to shoulder width

Watch-outs

Fixed loft — the wrong size cannot be corrected after purchase
Uncomfortable for back and stomach sleepers, so poor for combination sleepers
Solid foam retains heat

Best for: Dedicated side sleepers with broad shoulders who never roll onto their back

Pillow Cube pillow reviews

Browse every Pillow Cube product currently in our catalog. Each review links back here so the whole brand line can be compared in context.

Pillow Cube Side Cube Deluxe

Best for Dedicated side sleepers with broad shoulders who liked the original but wanted more surface

A block-shaped pillow intended for side sleeping. Verify the exact Deluxe model and height; compare removable fill if your preferred height is uncertain.

Verified specs: AeroPluff memory foam fill · 5 inches (Standard) loft · firm feel.

Research pick — based on manufacturer specifications and our research.

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Pillow Cube Side Cube Original

Best for Dedicated side sleepers with shoulder gap issues

A cube-shaped memory foam pillow engineered to fill the shoulder-to-ear gap and support alignment when the height matches your body and mattress.

Verified specs: Solid memory foam block fill · Choose 4, 5 or 6 in by shoulder width loft · firm feel · 60 nights trial · 3 years warranty.

Research pick — based on manufacturer specifications and our research.

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Pillow Cube comparisons

Head-to-head pages involving Pillow Cube, organized around construction, adjustability, sleep-position fit, and buying risk.

Head to headPillow Cube vs ZAMAT Cervical PillowTwo side-sleeper specialists: a firm foam cube that fills the shoulder gap, and an adjustable contoured cervical pillow with a shoulder notch. Head to headCoop Original vs Pillow Cube Side CubeCoop Original lets you change the amount of loose fill. Side Cube Original is a fixed 12 × 24 × 5-inch block. The meaningful choice is between a pillow you ca Head to headPillow Cube vs Cushion Lab Deep Sleep PillowPillow Cube Side Cube Original and Cushion Lab Deep Sleep Pillow compared on construction, adjustability, sleep-position fit, and value using published product information. Head to headHoneyDew Scrumptious vs Pillow CubeHoneyDew Scrumptious Side Pillow and Pillow Cube Side Cube Original compared on construction, adjustability, sleep-position fit, and value using published product information. Head to headPurple Harmony vs Pillow CubePurple Harmony Pillow and Pillow Cube Side Cube Original compared on construction, adjustability, sleep-position fit, and value using published product information. Head to headEli & Elm vs Pillow CubeEli & Elm Side Sleeper Pillow and Pillow Cube Side Cube Original compared on construction, adjustability, sleep-position fit, and value using published product information. Head to headPillow Cube Side Cube vs Side Cube DeluxePillow Cube Side Cube Original and Pillow Cube Side Cube Deluxe compared on construction, adjustability, sleep-position fit, and value using published product information. Head to headTEMPUR-Neck vs Pillow Cube Side CubeTEMPUR-Neck is a molded neck contour available in several fixed profiles. Side Cube Original is a rectangular 12 × 24 × 5-inch block aimed at side sleeping. N

Guides related to Pillow Cube

Use these guides to decide whether the brand's materials, loft, and design make sense for your sleep setup.

GuidePillow Loft for Side Sleepers on a Firm MattressA firm mattress keeps your shoulder near the surface, so the head-to-mattress gap is at its biggest. Side sleepers usually need more loft — and a fill that will not collapse under it. GuideFirm vs Soft Pillow for Side Sleepers: Which Is Right?Side sleepers need medium-firm support that holds loft under load — but firmness and height are different dials. Here's how to set each. GuidePillow Loft for Side Sleepers on a Soft MattressOn a plush mattress your shoulder sinks in and the head-to-mattress gap shrinks — so side sleepers usually need less loft than standard advice suggests. Here are the numbers and the fills that suit it. GuideWhat Type of Pillow Is Best for Side Sleepers?Side sleepers need higher loft and firmer support than any other position. Here's how to pick loft, fill, and shape — plus the mistakes that cause morning neck pain. GuideIs It Better to Sleep Without a Pillow?Sleeping without a pillow can help some stomach sleepers and certain back conditions, but it makes side sleeping worse. Here's how to tell if going pillowless is right for you. GuidePillow Height for Side Sleepers on Soft vs Firm MattressesThe same side sleeper needs up to two inches more loft on a firm mattress than a soft one. Here's why, and how to adjust.

Comparing brands? Start with our overall best pillows list or the pillow finder.

Affiliate disclosure: Mr. Squish may earn a commission when you buy through links on this page. Affiliate relationships never determine our recommendations — see how we test.