How to add adjustable features to fixed concrete outdoor armchairs?

Concrete outdoor armchairs are durable and stylish but often lack adjustability. Here’s how to modify them for better comfort:

1. Add Cushions with Straps – Use thick outdoor cushions with adjustable straps to change seating angles.

2. Install Adjustable Backrests – Attach a wooden or metal backrest with hinges for reclining options.

3. Use Removable Pillows – Place lumbar or neck pillows for customizable support.

4. Attach Swivel Bases – Replace fixed legs with swivel bases for 360-degree rotation.

5. Incorporate Sliding Seat Panels – Add a sliding wooden seat to adjust depth.

These simple upgrades make concrete armchairs more versatile without compromising their sturdy design.