Two...one for each cheek
Brookestone is a great place to purchase comfortable seat cushions. They sell cushions with lumbar support and Tempur-Pedic material. The seat cushions come in various sizes, colors, and material.
You can go to Walmart and get some outdoor seat cushions for as low as $15, the cushions are very fashionable too so you dont have to worry about ugly furniture.
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There are many types of cushions that you can choose for outdoor use; the Home Depot and Lowes sell great products, and they have their own name brands.
Pillows, mattresses, cushions, seat pads in furniture
Yes! For a patio couch, choose wicker with cushions for the seat and the back. Bench-style couches have storage in the seat, which is a bonus. Most have cushions that should be removed over the winter, and can be washed and hung to dry.
The best place to buy patio furniture seat cushions is at Canadian Tire. They are also very well priced. They also have sets that have fireplaces built right into the center of the tables.
Under the back seat cushions in the middle. the bottom
The local Wal-Mart shopping center caters to those who wish to buy inexpensive materials, you can buy outdoor cushions as well as some indoor cushions to make your house look nice.
TheFoamFactory.com offers various foam options for your seat cushions. You can order in various sizes and shapes for whatever your project may require.
At http://www.slipcovershop.com/Product_List/elasticized_cushion_cover.asp you can find many different designs and patterns at great prices for your window seat cushions.
You can always remove the mattress and leave the frame in the sofa. In many cases the frame helps support the seat cushions.