Replacing an orthotic top cover is a straightforward repair you can do at home with basic tools and about an hour of time. The top cover is the fabric or foam layer that sits against the bottom of your foot, and it wears out much faster than the orthotic shell underneath. Swapping it out can restore comfort and extend the life of your custom orthotics by years.
When Your Top Cover Needs Replacing
The top cover takes the most abuse of any part of your orthotic. Look for cracks, thinning spots, or areas where the material has gone completely flat. If you can see the hard shell through the cover, or the surface has become slick and compressed under the ball of your foot or heel, it’s time. You might also notice the orthotic sliding around in your shoe more than it used to, or that the cushioning simply doesn’t feel like it did when the orthotics were new.
Most top covers last 6 to 12 months with daily wear, though this varies with activity level and material. The orthotic shell itself can last several years, so replacing just the cover is far cheaper than ordering a new pair of custom orthotics.
Choosing a Replacement Material
Top cover materials come in a range of options, each with tradeoffs. The most common choice for DIY replacement is EVA (ethylene-vinyl acetate), a lightweight foam that provides excellent shock absorption and pressure distribution. It’s easy to work with and widely available from orthotic supply shops online. The downside is that EVA compresses over time and wears out faster than some alternatives.
If breathability matters to you, polyethylene foam (sometimes sold as Ucolite) has perforations that allow airflow, making it a good pick for athletic use. It also offers mild odor control. Neoprene is another option that provides strong cushioning and water resistance, though it runs thicker and can make shoes feel tighter. Leather gives a classic feel and holds up well to daily wear, but it offers minimal shock absorption on its own and needs occasional conditioning to resist moisture.
For most people doing a home replacement, a sheet of 1/16-inch or 1/8-inch EVA or polyethylene foam is the easiest to cut, glue, and finish cleanly.
Tools and Supplies You’ll Need
- Contact cement (Barge All-Purpose Cement is the industry standard for orthotic work)
- Top cover material in a sheet large enough to trace your orthotic
- Utility knife or sharp scissors
- Metal scraper or putty knife
- Fine-grit sandpaper or a sanding block (80 to 120 grit)
- Rubbing alcohol or acetone for cleaning old adhesive residue
- Pen or marker for tracing
- Small brush or applicator for spreading cement
A rotary tool (like a Dremel) with a sanding drum makes the job faster and produces cleaner edges, but it isn’t strictly necessary. A heat gun can help soften stubborn old adhesive during removal, though a hair dryer on its highest setting can work in a pinch.
Removing the Old Top Cover
Start by peeling back a corner of the old cover with your fingers or a metal scraper. Work slowly to avoid gouging the orthotic shell underneath. Some covers will peel off in one piece; others will come off in strips and leave behind patches of dried adhesive. That’s normal.
For stubborn sections that won’t peel, apply gentle heat with a heat gun or hair dryer to soften the old cement, then scrape with a metal putty knife. Professional repair shops sometimes use a solvent (like the thinner that comes with contact cement) to dissolve remaining adhesive. If you go this route, apply a small amount to a rag and rub the residue until it loosens, then scrape clean. A rotary tool with a sanding attachment can handle the most persistent spots quickly.
The goal is a smooth, clean shell with no lumps of old glue. Any bumps left behind will telegraph through the new cover and create uncomfortable pressure points.
Preparing the Shell Surface
Once the old cover and adhesive are removed, lightly sand the entire top surface of the orthotic shell with fine-grit sandpaper. This creates a slightly rough texture that helps the new adhesive bond properly. Pay attention to the edges, especially around the heel cup and arch, smoothing out any sharp spots.
After sanding, wipe the surface with rubbing alcohol to remove dust and any remaining residue. Let it dry completely before applying adhesive. A clean, dry, lightly roughened surface is the single biggest factor in getting a bond that lasts.
Cutting the New Top Cover
Place your orthotic shell face-down on the top cover material and trace around it with a pen. Cut roughly 1/4 inch outside the traced line. You want the cover slightly oversized at this stage because you’ll trim it precisely after bonding. Trying to cut it to exact size beforehand almost always results in edges that don’t quite line up.
If your orthotic has a deep heel cup, you may need to make small relief cuts at the heel so the cover can wrap smoothly around the curved edges without bunching.
Gluing and Bonding
Apply a thin, even coat of contact cement to both the orthotic shell and the back side of the top cover material. Use a small brush or the applicator that comes with the cement. Cover the entire surface, including the inside of the heel cup, but avoid globbing it on. Excess adhesive squeezes out during bonding and creates a messy finish that’s hard to clean up.
Let both surfaces dry until the adhesive is tacky to the touch but doesn’t transfer to your finger. With Barge cement, this takes 10 to 15 minutes. The timing matters: press too early and the bond will be weak and slidey; wait too long and the adhesive dries past its bonding window. In humid conditions, give it a couple of extra minutes.
Once both surfaces are tacky, carefully align the cover to the shell starting at the toe end and pressing backward toward the heel. Contact cement bonds on contact, so you won’t be able to reposition once the surfaces touch. Press firmly across the entire surface, paying special attention to the arch and heel cup where the cover needs to conform to curves. Use your thumbs to work out any air pockets or wrinkles, pressing from center to edges.
Trimming and Finishing the Edges
After bonding, let the adhesive cure for at least 15 to 20 minutes before trimming. Using a sharp utility knife, trim the excess top cover material flush with the edge of the orthotic shell. Hold the blade at a slight angle to create a beveled edge rather than a blunt cut. This bevel helps the orthotic slide into your shoe without catching and gives it a more professional look.
If you have a rotary tool, a sanding drum makes quick work of smoothing the trimmed edges. Otherwise, run fine-grit sandpaper along the perimeter to clean up any rough spots. Check the heel cup area carefully, as this is where uneven edges are most noticeable inside a shoe.
Let the completed orthotics sit for a full 24 hours before wearing them. While the initial tack is strong, the bond reaches full strength overnight. Placing them under a stack of heavy books during this time helps ensure even pressure across the surface.
Tips for a Longer-Lasting Cover
Rotating between two pairs of orthotics, if you have them, dramatically extends top cover life by giving each pair time to decompress and dry out between wears. Moisture is the enemy of both the cover material and the adhesive bond, so pulling your orthotics out of your shoes at night to air dry makes a noticeable difference.
If you find yourself replacing covers more than twice a year, consider switching to a more durable material. Neoprene or a leather cover will outlast EVA foam significantly, especially for high-mileage walkers or runners. The tradeoff in breathability or thickness may be worth the longer replacement interval.