Measure the width of the couch from inseam to inseam. Write the number down.
Measure the length from inseam to inseam. Write it down.
Measure the depth from inseam to inseam and write down. Repeat for any different shaped cushions.
Order your cushions. I used www.cushionsxpress.com/ for my order. They are a bit more expensive than other online places, but they have an amazing YouTube about the different foam types. I got fm3618.
When your cushions arrive, take the covers off the old cushions. I would recommend throwing them in the washer. :)
It might also be a good idea to vacuum the couch.
After the covers are all clean, it's time to put them on the new cushions.
Gently slide the covers on the cushion. I didn't get the dacron option as you can see.
Voila! One cushion down. repeat until you have covered all of the foam cushions.
Enjoy your newly cushioned and super comfy couch!