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

If you’ve invested in a custom-size mattress—whether for an RV, boat, loft bed, or uniquely designed bedroom—you’ll quickly realize that standard bed sheets simply won’t fit. Ordering sheets for a non-standard mattress requires attention to detail to ensure a snug fit, comfort, and longevity. Here are the 8 most important factors to consider when buying custom bed sheets.

1. Measure Your Custom Mattress Precisely

Start with the exact measurements of your mattress:

• Length
• Width
• Depth (or thickness)

Always use a tape measure and record the dimensions in inches or centimeters—whatever unit your supplier prefers. Even an inch off can make your fitted sheets bunch or slip, especially if the mattress has rounded corners or a special shape.

2. Account for Pocket Depth in Fitted Sheets

One of the most common problems with poorly fitting sheets is incorrect pocket depth. This refers to how deep the corners of the fitted sheet go over your mattress.

• Standard pocket: Up to 12”
• Deep pocket: 13–17”
• Extra-deep pocket: 18”+

For custom mattresses, make sure your fitted sheets are at least 1–2 inches deeper than the mattress itself to allow for shrinkage and easy tucking.

3. Consider Mattress Shape and Structure

Not all mattresses are rectangular. If your bed has:

• Rounded corners
• Angled sides
• Cutouts for RVs or boats
• Split mattress setups

…then you need custom-fitted sheets tailored to those specifics. Provide your sheet maker with detailed drawings, diagrams, or even photos so they can recreate the perfect fit.

4. Plan for Fabric Shrinkage

Most natural fabrics shrink a bit after the first few washes—especially cotton, bamboo, and linen. Expect a 3–5% shrink rate unless the fabric is pre-washed or pre-shrunk.

When ordering, ask the supplier whether the material is preshrunk. If not, increase your sheet measurements slightly to account for post-wash tightening.

5. Choose the Right Fabric Type

Your choice of fabric can significantly impact how comfortable and durable your sheets are. Some of the most popular options for custom sheets include:

• Cotton percale or sateen – breathable, crisp or silky
• Linen – airy and moisture-wicking, perfect for hot sleepers
• Bamboo or Tencel – eco-friendly, soft, and cool
• Flannel – great for warmth in colder climates
• Polyester blends – budget-friendly and wrinkle-resistant

6. Look at Elastic Placement and Type

The quality and placement of elastic on your fitted sheet matters for secure fitting:

• Full elastic around all edges offers the most reliable hold.
• Corner-only elastic is cheaper but more prone to slipping off.
• For unusual shapes, drawstring-style fitted sheets can be ideal, offering adjustable tension.

7. Don’t Forget the Other Sheet Set Components

Ordering sheets for a custom-size mattress isn’t just about the fitted sheet. You’ll likely need:

• A flat sheet sized for proper drape and coverage
• Pillowcases that fit your unique pillows (standard, king, euro, or custom shapes)

Make sure your custom bedding order includes these items—or ask if they can be added separately.

8. Work with a Reputable Custom Sheet Supplier

Not all bedding companies offer customization. Choose a provider that:

• Has experience with non-standard mattresses
• Can verify your dimensions before production
• Offers clear policies for custom orders
• Communicates well and offers fabric samples if needed

A good supplier will help guide you through the process and minimize costly mistakes.

Final Thoughts: Custom Sheets Made Easy

Ordering sheets for a custom-size mattress doesn’t have to be stressful. With the right measurements, fabric choices, and supplier, you can get perfectly fitted bedding that feels as good as it looks. Whether you’re outfitting an RV, boat, loft, or designer bed, taking the time to get your custom bedding right ensures better sleep and longer-lasting sheets.