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DIY Foam Car Accessories

If you spend a lot of time or your life on the road, you know that spending most of that time in a vehicle behind the steering wheel is not always a comfortable experience. No matter the vehicle interior, the design is often based on averages. Unfortunately, no two people are exactly alike! Height, weight, shape, and health all differs and means that perhaps a seat belt that fits well on one person cuts into their neck on the next.

Plus, our personal needs from our vehicles are most likely different as well. Perhaps the driver’s original seat cushion is a bit too hard or uncomfortable, maybe you are looking for more out of your trunk or a bit of peace from the backseat during long drives.

We have excellent DIY foam car projects and accessories to make your next road trip, be it to work, for work, or a family drive that will no doubt elevate your comfort and make the ride smooth and comfortable.

DIY Seatbelt Foam Sleeve

A seatbelt foam sleeve is for all ages to feel more comfortable wearing their belts. If you find your seatbelt often cutting into your neck or, shoulder, you can easily make a seatbelt foam sleeve to keep it from aggravating you and your skin.


  • Fabric scissors
  • Tailor’s measuring tape
  • Super Soft Foam or Cloth-backed foam- Remay cut into a rectangle of 7″ x 10″
  • Favorite, super soft fabric cut into two rectangles of 7″x10″
  • Pins
  • Serger or sewing machine
  • ¾ yard 7″ (3/4″ wide) sew-on Velcro
  • Coordinating thread that works with your fabric


  1. Start by layering the fabric you choose to use by making a sandwich—place the outer fabrics outside, with the right sides facing out and your Cloth-backed foam in the middle. To help save some time and cut down on error, try to cut out the shape on all three layers at the same time. Then, once cut, pin together immediately without moving your pieces to ensure they don’t shift. This will help you keep an even and nice-looking edge once the seatbelt foam sleeve is finished.
  2. Cut out a rectangle of 7″ x 10″. (You can always choose to create this sleeve longer or shorter, but you need it to be at least 7″ wise so that it will fit around the seatbelt strap and have room for the Velcro.)
  3. If you have a serger, sergers work best at this step as they give the most professional looking edge and trim all three layers to the same spot. If you do not have a serger, we cover how to use a regular sewing machine in the next step.
    • For a serger, use both serger needles (4 threads) and set the tensions to 4 (may be the normal tension setting on your machine). Set the stitch length to the longest available and be very sure to remove every pin when using a serger. Sergers cut the fabric as they sew and wrap the edge. You do not want your pins to ruin your serger blade!
    • Sergers do not have backstitching, so stitch over your starting stitching for roughly 1 inch and leave a long thread tail so that you can use a large-eyed needle to pull the tail through stitching and trim.
    • Double-check your stitches went through all 3 layers.
  4. For sewing machines, set your machine to a very wide zigzag stitch and sew around the edges. The right edge of the zigzag should be just barely off your fabric and the left edge will be about ¼ of an inch onto the fabric. Make sure your stitching goes through all three layers.
  5. Decide which side of the sleeve is ‘outside,’ and which is ‘inside.’ Make sure to sew the velcro strips along the outer edges of the side which will be INSIDE the seat cover (the sides folded over the seatbelt itself).
  6. Enjoy! Wrap the sleeve around the belt where it tends to cut through and enjoy a softer, more comfortable seatbelt!

DIY Trunk Storage

Did you know you can make a lightweight, excellent trunk storage box using foam? With a foam box in the trunk, you can use it to store either your groceries to keep them from rattling around or any other item you may have in the trunk of your vehicle.


  • Solid charcoal firm foam or polystyrene foam
  • Tape measure
  • Pencil
  • Craft knife or sharp utility knife
  • Measurements of your trunk space
  • Ruler
  • Hot glue gun


  1. Measure your trunk space, width, and length. Now, consider the height, width, and depth of the desired box you would like in your trunk. You could make one very large box that spans the width of the trunk, or several smaller, evenly sized boxes.
    • Tip: Make sure to not use scissors when cutting. Always use a craft knife or utility knife. For straighter lines and guidance, use a ruler’s edge for straight cuts.
  2. Using your ruler as your guide, mark out the proportions of the boxes you would like. There should be 5 pieces drawn into your foam board. Begin cutting the edges, using your ruler as a guide until all 5 pieces have been cut.
  3. One piece of foam will be the bottom. Place the bottom foam board on an even surface and begin to use your hot glue gun to run glue around the back edge. Place a second foam board directly onto the line of glue to create a wall and hold it for a few seconds to allow the glue to hold and set. Next, repeat the same steps for the next 3 pieces and then set aside to dry for a good hour and a half.
  4. The last step is to reinforce your new trunk box organizer with a thin layer of glue along the bottom of edges where the sides meet the bottom and anywhere else you think needs it. Let it dry for another hour and a half.
  5. Decorate or use right away, enjoying your new storage option.

For all your foam needs and newest DIYs, don’t forget your number one source of the largest variety of foams right here. We hope you’ve enjoyed these DIY foam car accessories. Check out our social media for more inspiring ideas and ideas and don’t forget to check out our blog for even more wonderful foam solutions!

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