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Use Coupon Code: FROSTY15 & Get 15% Off Sitewide
  • Custom Cushion Experts
  • Any Size
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  • Loved by 50,000+ Homes

18 x 20 Patio Cushions

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  • Outdoor cushions 18 x 20, designed for long-lasting comfort
  • Weather-, and UV-resistant fabric designed for durability
  • Durable foam filling offers relaxation
  • Variety of fabrics, colors, and patterns available
  • Easy to install, remove, clean, and maintain

Made Right for Everyday Outdoor Seating

When your outdoor furniture needs 18 x 20 outdoor seat cushions, you're working with precise space constraints. These smaller dimensions work perfectly for bistro sets, apartment balconies, and breakfast nook chairs where standard cushions overwhelm the scale. The compact 18 x 20 size provides full seat coverage without hanging over edges or creating bulk that makes small spaces feel cramped. Weather resistant fabric and dense foam construction mean these cushions maintain their comfort and appearance through daily use, turning those hard metal or plastic seats into places people actually want to sit for more than a few minutes.

Use Cases:

  • For dining sets and accent chairs
  • For backyard and poolside furniture
  • Upgrades for seat cushions or bistro chairs 
  • Porch chair, folding chair, or portable seating
  • Replacement outdoor seat cushions for worn-out pads
  • Custom-fit for odd-shaped or hard-to-fit seating
  • Pick from a curated catalogue of performance fabrics built for life outdoors.
  • Available in a range of solids, prints, stripes, and textures
  • Designed to resist fading, moisture, mold, and mildew.
  • Easy to maintain, spot clean or machine wash depending on fabric.

Foam Core Options:

  • Choose the level of support that suits your seating style.
  • Soft, medium, or firm high-resilience foam for lasting shape retention.
  • Add a Dacron fiber wrap for a fuller look and a cushier finish.

Whether you’re updating the cushions on an outdoor pergola setup or redesigning a private patio, 18 x 20 patio chair cushions are the standard size for most outdoor furniture. Pick your ideal fabric, foam density, color, and pattern to create cushions that match your exact vision of an outdoor space that reflects your style. 

Why Choose Our Custom Outdoor Couch Cushions?

  • Perfect Fit, Every Time:These 18 x 20 patio chair cushions are crafted to standard dimensions, so they sit properly on chairs without awkward overhang or gaps that make them look cheap.
  • Weather-Ready: Choose outdoor-rated fabrics built to resist fading, water, and mildew.
  • Comfort That Stays:High-density foam holds its shape through seasons of use.
  • Easy Care:Zip-off covers make maintenance simple.
  • Customizable:Select your fabric, foam firmness, and thickness for a cushion that matches your seating and your lifestyle.
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Frequently Asked Questions

Always measure between the seams or between the cording of the case. Measure the length, width, and thickness of square and rectangular shapes. For round and cylindrical shapes, measure diameter and thickness. Custom cushions require additional measurements based on the type of shape.

18x18 and 18x20 Inches are the medium sizes that work well on most sofas, chairs, and beds, while 20x20 inches is popular for large cushions.

If your backseat is 18 x 20 in dimension, yes. Otherwise, we recommend ordering separate back cushions for a better fit. Back seat cushions should be more comfortable and may have a different thickness than your seat cushions.

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Customer Reviews

Based on 734 reviews
90%
(662)
8%
(58)
1%
(9)
0%
(2)
0%
(3)
D
Denise Zamiska (Austin, US)
Breakfast Bench Cushions

I ordered these cushions last week and was told it would be a 3-4 week wait. What a surprise when they came today, about 8-9 days after I ordered them. They look amazing and look very professionally stitched. Thank you Zip Cushions, I never knew it would be this easy to order these on line. Would definitely recommend!

C
C.Z.

The cushion is pretty and very well made.

A
Alicia P. (Richmond, US)
Cushions for Banquette

My cushions arrived in just under 3-weeks and fit my custom benches perfectly. Oscar and Isaac provised excellent customer service. They were patient and very accommodating as I had to adjust the dimensions a few times. I'm happy I chose Zip Cushions!

C
Cherise

The cushion we ordered is exactly what we had hoped for. The quality is excellent, color is great and it arrived sooner than expected. Very satisfied. Thank you so much!

K
Kathleen

These cushions are perfectly sized and beautifully sewn.

M
Margaret

perfect great quality. Would highly recommend this company

M
Margaret

Perfect and great quality

M
Margaret

Perfect! And great quality

J
J.W.

They look great and fit perfectly!

t
theresa

The cushions for my outdoor bench came exacty as i wanted. The color was like the sample, the measurements were spot on, and delivery was pretty quick! It was definitely an investment, but the quality is evident.

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