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Questions about beds and mattresses answered. And some stories told.

At Nine Clouds Beds we can make a mattress any size including 66.5" x 77.5"

1. Understand the Size You Need

A mattress measuring 66.5″ × 77.5″ is not a standard size. The closest standard options are:

• King: 76″ × 80″

• California King: 72″ × 84″

Because your dimensions are unique, you will likely need a custom-made mattress or a mattress that can be cut to size. Before ordering, measure your bed frame carefully and confirm whether the mattress needs to fit tightly or with slight clearance.

2. What “Firm” Means

Firmness describes how much resistance the mattress provides when you lie on it. Most manufacturers use a firmness scale from 1 (very soft) to 10 (very firm).

• Firm mattresses typically fall between 7 and 9

• Best suited for back sleepers, stomach sleepers, heavier individuals, or anyone who prefers minimal sink-in

A firm mattress can help maintain spinal alignment, reduce sagging over time, and make movement easier during sleep.

3. Mattress Construction Options

Different constructions affect feel, durability, and support.

Innerspring

• Coil-based support

• Strong, traditional firmness

• Good airflow, less contouring

Hybrid

• Combination of coils and foam

• Firm support with some pressure relief

• Good for combination sleepers

High-Density Foam

• Solid, supportive feel

• Excellent motion isolation

• Can feel very firm depending on density

Latex

• Naturally supportive and resilient

• Long-lasting and breathable

• Often firmer than memory foam without feeling hard

4. Finding a Mattress in a Custom Size

Custom Mattress Manufacturers
Some brands offer made-to-order sizing. You’ll usually need to contact customer service directly to confirm dimensions, firmness, and materials.

Local Mattress Makers or Upholsterers
Local manufacturers often specialize in custom sizing and firmness levels. This can be a good option if you want precise control over materials and feel.

Modified Standard Mattress
In some cases, a slightly larger mattress can be professionally trimmed by an upholstery shop. This works best with foam or latex mattresses.

5. Features to Prioritize

Support Core
Look for high-density foam or strong coil systems designed for long-term firmness.

Material Quality
Higher-density foams and thicker coil gauges maintain firmness longer.

Edge Support
Important if you sit or sleep near the edge of the mattress.

Trial and Return Policy
Custom mattresses often have limited return options, so test similar firmness levels in-store if possible.

Warranty
A warranty of at least 10 years is standard for quality mattresses.

6. Shopping Tips

Before buying:

• Measure your bed frame at multiple points

• Confirm mattress height limits, especially for fitted sheets

In-store testing:

• Lie down for at least 10–15 minutes

• Test in your normal sleeping position

• Ask how their “firm” compares to other brands

Online purchasing:

• Read firmness descriptions carefully

• Verify customization policies

• Confirm production and delivery timelines

7. Price Expectations

Custom sizes typically cost more than standard mattresses.

• Custom foam: approximately $1,000–$2,000+

• Custom hybrid( Best value): approximately $1,500–$3,000+

• Custom latex ( Best): approximately $2,500–$4,000+

Prices vary based on materials, thickness, and manufacturer.