What is the width of the cushion? The description shows 18" x 16" x 3", further described as 18" deep and 16" wide. True size?

Thanks for your question. There is a picture to show the details about the size of the cushion in the product listing: Lenth:18", Width: 16", Thickness: 3" For any further issues, you can contact our customer service. (Email address: support@iauvon.com).

is a replacement cover available for this cushion?

No don't buy falls apart in washer

Will this work in a Broka high back wheelchair?

As long as your seat is a standard type seat that you sit on I don't see why you couldn't use this one. I use this on my battery operated wheelchair and my manual wheelchair it seems to fit on everything. My manual wheelchair is only a 16 inch seat and it fits perfectly I hope that helps good luck

Can this be completely submerged under water?

Would not recomend. Foam inside would not absorb water, and would float.

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Description

🪑 Elevate your seat game—comfort that keeps up with your hustle!

COOL CLEAN ALL DAY - Waterproof, breathable cover with vent holes prevents moisture buildup and is machine washable for effortless hygiene.
ERGONOMIC U CUT DESIGN - Unique cutout floats your tailbone, reducing pressure and promoting spinal alignment for long-lasting comfort.
STAY SECURE SIT CONFIDENT - Non-slip base and adjustable strap keep your cushion perfectly in place—no more shifting during your busy day.
VERSATILE FIT FOR EVERY SEAT - Sized 18"x16"x3", fits most wheelchairs, office chairs, car seats, and more—upgrade any seat to premium comfort.
TAILORED COMFORT WITH SMART FOAM - Premium memory foam contours to your body heat, evenly distributing weight to ease sciatica, coccyx, and back pain.

The AUVON Wheelchair Seat Cushion combines premium ventilated memory foam with an ergonomic U-cut design to relieve pressure on the tailbone, back, and coccyx. Featuring a non-slip bottom and detachable strap, it ensures a secure fit on most chairs. Its breathable, waterproof cover with vent holes protects against moisture and is machine washable, making it ideal for daily use and long sitting sessions.

Specifications

Brand	AUVON
Special Feature	Carry Handle, Premium Ventilated Memory Foam, Waterproof Cover
Color	Black
Size	M (18x16x3in)
Fill Material	Premium Memory Foam
Shape	Square
Age Range (Description)	29.99
Recommended Uses For Product	Pressure Sore,Ulcer Pain Relief
Use for	Back
Material	Memory Foam
Item Firmness Description	Soft
Product Care Instructions	Memory foam is non-washable. Machine wash the removable cover cold on a gentle cycle. Avoid bleach or dry cleaning. After washing, allow the cover to air dry naturally before use.
Number of Pieces	1
Pattern	Solid
Item Weight	1.54 Pounds
Material Feature	Breathable
Material Type Free	Pesticide Free
Fabric Type	Soft Velour Fabric
Model Name	SC1111
Specific Uses For Product	Pressure Sore,Ulcer Pain Relief
Manufacturer	AUVON
Product Dimensions	18"L x 16"W
Unit Count	1 Count
Item Weight	1.54 pounds
Item model number	SC1111
Material Type	Memory Foam
Number of Items	1
Manufacturer Part Number	SC1111

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