You will need:
Staple gun, scissors, foam*, new material, felt pen (for drawing on foam around seat), cordless drill.
1. Remove seat.
2. Staple-gun the material (with foam) to underside of seat (over the top of old material). Stretch it tight, easing in the corners as smoothly as possible.
3. Doesn't really matter if it's messy under there. No-one will see it.
5. Repeat six times.
|Before & after.|
* My chairs were rather deficit in the derriere seating area (like me), so I added an extra foam piece to each one. I had a strip left over from trimming a topper pad for a bed.