Updating your sofa seat is a great way to refresh your living space and increase comfort. Start by assessing the current state of your sofa seat cushions. If they feel saggy or uncomfortable, it's time for a change. Here’s a step-by-step guide:

1. Measure and Purchase Foam: Measure your sofa seat cushions to determine how much foam you'll need. Purchase high-density sofa seat cushion foam for better durability and comfort.

2. Remove Old Foam: Carefully remove the old foam from the cushion covers. It’s a good idea to wear gloves as old foam can sometimes crumble and create dust.

3. Cut New Foam: Using the measurements of your old cushions, cut the new foam to size. An electric carving knife can make this job easier and give you cleaner cuts.

4. Insert Foam into Covers: Insert the new foam into your cushion covers. If the covers are washable, it's a good idea to clean them before inserting new foam.

5. Check the Fit: After inserting the new foam, check that it fits snugly within the covers without any bulging or gaps.

6. Reassemble Sofa: Place the refreshed cushions back on your sofa. Sit down to feel the difference in comfort and support.

This update not only improves the aesthetics of your sofa but also enhances the overall comfort, making your seating area feel like new.