Derila Ergo vs Coop Pillow: Memory Foam and Adjustable Pillow Designs Compared

The Derila Ergo and the Coop Original Adjustable Pillow represent two opposite approaches to the same problem. The Ergo is a fixed, shaped memory-foam pillow. The Coop is a rectangular pillow filled with loose, cross-cut memory foam and microfiber that you can add to or remove, so you choose the height and firmness yourself. This comparison sets out what each brand publishes, where details differ, and which kind of sleeper may prefer which design. It does not name a winner.

Affiliate disclosure: Wellness Center USA may earn a commission if you buy a Derila Ergo through links on this page, at no extra cost to you. Coop is not a product in our catalog, and we link to it only as a reference. Our comparison does not depend on commissions. See our affiliate disclosure.

How We Compared Them

• Derila Ergo: details come from the official Derila store as recorded in our Derila Ergo review and product page.
• Coop: details come from the official Coop Sleep Goods page for the Original Adjustable Pillow (coopsleepgoods.com), which we checked in October 2026. Coop sells several different pillows (including Eden, adjustable latex, cut-out, crescent, and maternity models), and this comparison covers only the Original Adjustable Pillow, not Coop pillows in general. The brand has appeared as both "Coop Home Goods" and "Coop Sleep Goods."
• We have not tested either pillow.
• Prices change often. The Coop page data listed prices in the US$80s to US$90s for queen and king sizes on the day we checked, and they moved by pennies between checks, while Derila's price is set at checkout. We do not rely on prices here. Compare the final total, with shipping and tax, when you buy.

Illustrative stock image, not a photograph of either product.

Side-by-Side Comparison

Feature	Derila Ergo	Coop Original Adjustable Pillow
Design	Fixed contour with different height zones, shoulder arches, and arm-support areas	Rectangular pillow with an interlocking dual-case system you can open to adjust the fill
Fill / core	100% polyurethane memory foam (single piece)	Cross-cut memory foam and microfiber blend (loose fill), with extra fill included
Adjustable?	No adjustable fill or insert described	Yes. Add or remove fill to set loft and firmness
Size	21.3 × 14.2 × 4.7 in; 36.9 oz	Queen 19 × 29 in; King 19 × 35 in (per the product page)
Cover	Removable cooling cover, machine washable	Outer cover of 60% polyester and 40% bamboo-derived viscose rayon, machine washable; liner is 100% polyester
Washing the core	Do not machine-wash; spot-clean and air dry	The page says the pillow and cover are machine washable and dryer friendly
Certifications	CertiPUR-US claimed (manufacturer claim; not confirmed in CertiPUR-US database by CHOICE)	GREENGUARD Gold and CertiPUR-US certified, per Coop
Trial / returns	60-day return policy; customer pays return shipping; original packaging required	100-night guarantee; the page data lists free returns by mail
Warranty	Not stated on pages we reviewed	5-year limited warranty
Sleeping positions	Product text says back and stomach sleepers; FAQ gives side-sleeper advice	Coop says it can be adjusted for side, back, and stomach sleepers
Price	Not verified	Listed in the US$80s–$90s on the day we checked; confirm

Construction and Materials

Derila Ergo. A single piece of polyurethane memory foam cut into a contour. Memory foam softens with warmth and molds to pressure, then recovers slowly. The foam's density is not published.

Coop Original. A mix of cross-cut memory foam and microfiber inside a zippered liner, inside a washable cover. Coop explains that cross-cut foam is meant to clump less than shredded foam and to allow more airflow. Because the fill is loose, the pillow molds and shifts, and it may need occasional fluffing; Coop suggests a short time in the dryer if it flattens.

Adjustable Versus Fixed

This is the biggest practical difference.

• Fixed (Ergo). The shape guides your head and neck, and the shoulder and arm areas may suit people who like that structure. But if the height is wrong for you, you cannot change it, and the zone heights are not published.
• Adjustable (Coop). You can remove fill to lower the loft or add the included extra fill to raise it. That makes it easier to fine-tune for side, back, or stomach sleeping, though loose fill can feel less structured, and some reviewers dislike how shredded-style fill shifts.

Research does not identify a single ideal pillow height. A 2021 review in Healthcare (Lei and colleagues) concluded that "there remain no firm conclusions about the optimal pillow height for the supine and lateral positions," which is one reason an adjustable design appeals to many people.

Firmness and Support

The Ergo's feel depends on the foam and the contour, and it is described as firm by some customers. The Coop's firmness depends on how much fill you leave in, and Coop describes the fill as a medium-firm blend. Neither brand publishes an independent firmness rating that we could verify.

Pillow Height

The Ergo's overall height is 4.7 inches, with a higher and a lower end. The Coop's loft is variable, based on fill. For a side sleeper who needs more loft, an adjustable pillow may be easier to tune. For a back or stomach sleeper who needs less, you can remove fill.

Sleeping Positions

See our guides to the best pillow for side sleepers and choosing a pillow. In general, side sleepers need more loft, back sleepers medium to low, and stomach sleepers a thin pillow.

Maintenance

• Derila Ergo: wash the cover cold on gentle, never machine-wash the foam core, and let it air dry fully.
• Coop Original: Coop says the pillow and cover are machine washable and dryer friendly. Follow the care label, and make sure the fill is fully dry.

Returns and Warranty

• Derila: 60-day return policy, customer-paid return shipping, original undamaged packaging. A consumer organization (CHOICE) has raised concerns about the brand's checkout and returns in Australia; see our legitimacy guide.
• Coop: a 100-night guarantee and a 5-year limited warranty, with free returns listed in its page data. Read the exact conditions before you buy.

Return policies change, and they differ by country. Take a screenshot of the policy on the day you order.

What the Research Says

Studies do not show that either design is better for neck comfort. In a 2009 Manual Therapy study of 106 side sleepers (Gordon and colleagues), latex pillows outperformed participants' own pillows, foam and polyester pillows performed about the same as their own, and a foam contour pillow showed no advantage over regular shapes. None of these studies tested Derila or Coop products. Persistent neck pain should be assessed by a clinician.

Pros and Cons

	Pros	Cons
Derila Ergo	Shaped contour with shoulder and arm areas; one-piece foam that does not shift; removable washable cover	Fixed height; zone heights and foam density not published; inconsistent official guidance on positions; customer-paid return shipping; mixed customer feedback
Coop Original	Adjustable loft and firmness; extra fill included; machine-washable; longer trial and warranty	Loose fill can shift or need fluffing; some reviewers dislike the fill distribution; no built-in shoulder or arm shaping; may need trial and error to set the fill

Who Should Consider Each?

• The Ergo may suit someone who prefers a firm, structured one-piece contour, is comfortable with the fixed height, and is willing to read and follow the return terms carefully.
• The Coop Original may suit someone who is unsure about height, shares a bed with a partner who needs something different, or wants to adjust over time.
• Neither replaces medical care for neck pain, and neither treats sleep apnea.

See the Derila Ergo: derelaergo.com

Frequently Asked Questions

Which is better for side sleepers?

Neither is proven better. Side sleepers need enough loft to fill the shoulder gap, and the Coop lets you adjust that, while the Ergo's height is fixed.

Is the Coop pillow adjustable?

Yes. You can add or remove fill through the pillow's zippered liner.

Can I wash the Derila Ergo?

You can wash the cover, but the foam core should be spot-cleaned and air dried.

Which has a longer trial?

Coop lists a 100-night guarantee, and Derila advertises 60 days. Check the current terms.

Are all Coop pillows the same?

No. Coop sells several models. This comparison covers only the Original Adjustable Pillow.

Final Thoughts

If you value a shaped contour, the Ergo is built for that, but its fixed height and mixed customer feedback mean careful ordering. If you want control over height and firmness, an adjustable pillow such as the Coop Original is easier to tune, though loose fill is not for everyone. Whichever you pick, test it fairly and use the return window if it does not suit you.

Medical Disclaimer

This comparison is for general educational purposes only and does not provide medical advice, diagnosis, or treatment. Consult a qualified healthcare professional about neck pain or sleep problems. Product information comes from manufacturers' published pages, which can change.

References and Further Reading

• Coop Sleep Goods. The Original Adjustable Pillow (checked October 2026)
• Derila Ergo Neck Support Pillow: derelaergo.com
• Lei, et al. (2021). Pillow height for supine and lateral positions. Healthcare.
• Gordon SJ, Grimmer-Somers K, Trott P. (2009). Pillow use: the behaviour of cervical pain, sleep quality and pillow comfort in side sleepers. Manual Therapy.
• CHOICE. Derila pillows: unfair trading tactics