AAAAAcessories Outdoor Chair Cushion Set 18x16.5x3 + 18x20x3 in — Weather‑Resistant Polyester, Non‑Slip Ties

These AAAAAcessories outdoor chair cushions are a single-piece seating and back set sized 18×16.5×3" (seat) and 18×20×3" (back) designed to add weather-resistant comfort and non-slip stability to dining and patio chairs.

Whether you want to refresh a bistro set, make your outdoor dining more comfortable, or replace a worn cushion, this set combines a firm polyurethane seat and pillow with a UV-resistant polyester cover. The cushions ship compressed; allow time for full expansion. The cover zips off for cleaning and the ties plus anti-slip backing help keep the cushions in place on a variety of chair frames.

How does this cushion stand up to sun and rain?

The outer cover is made from 100% polyester that’s treated to resist fading and shed water, extending useful life when left on a covered patio or used seasonally. Breathable fabric helps moisture evaporate rather than trap it inside the foam.

• UV- and fade-resistant polyester shell for longer color retention
• Waterproof surface that deters light moisture and spills
• Hidden zipper design for easy removal and washing

Will these cushions stay put on my chairs?

Yes — the cushions include sewn ties for fastening to chair backs and an anti-slip bottom to reduce sliding on chair seats. That combination keeps the set secure during everyday use and prevents shifting when you sit down or stand up.

• Sewn-in ties to fasten to most dining and bistro chairs
• Non-slip underside for improved grip on smooth or slatted seats
• Compact 3" thickness maintains stability without feeling bulky

How comfortable and durable is the fill material?

The seat and pillow use 100% polyurethane foam that offers steady support while relieving pressure for short- to medium-duration seating. The foam ships compressed and typically regains shape within 24 hours of unpacking.

• 100% polyurethane foam seat for supportive comfort
• Pillow uses the same foam for consistent feel and support
• Compressed shipping; allow about 24 hours to fully expand

What chair types fit these dimensions and how should I measure?

The seat measures 18×16.5×3" and the back is 18×20×3" — check both seat depth/width and back height before ordering. If your chair dimension differs by more than about 0.5" from these measurements, consider a different size to ensure secure fit and neat appearance.

• Designed for dining chairs, bistro sets, and compact outdoor seating
• Measure seat width and depth, and back height for best fit
• If difference exceeds 0.5", choose a closer size to avoid slipping

Who is this for: Homeowners and renters looking to upgrade outdoor seating without replacing furniture, small-café owners who need durable customer seating, or anyone seeking a practical, easy-care cushion set for patios, balconies, decks, and garden chairs. The AAAAAcessories cushion works well when you want weather-ready materials, simple maintenance, and a no-fuss installation on standard-sized chairs.