Making your own knee pads is a straightforward sewing project that lets you customize the fit, padding thickness, and durability for your specific activity, whether that’s gardening, flooring work, or skating. You need three core components: a tough outer shell fabric, the right foam padding, and a strap system that keeps everything in place. The whole project takes about an hour with a basic sewing machine.
Choosing Your Materials
The outer fabric is the most important decision because it determines how long your knee pads last. Cordura nylon is the standard in commercial knee pads for good reason: it resists abrasion on concrete, gravel, and rough surfaces while staying flexible enough to bend with your knee. You can find Cordura in fabric shops or online, typically in 500-denier or 1000-denier weights. The higher the denier, the tougher the fabric, but also the stiffer. For gardening or light indoor work, heavy-duty canvas or vinyl works fine and is easier to sew.
For the inner lining (the side against your leg), choose something soft and breathable. Cotton, jersey knit, or fleece all work well. If you’ll be sweating, moisture-wicking athletic fabric is worth the extra cost.
Picking the Right Foam
You have two main options for padding: closed-cell foam and open-cell foam. Closed-cell foam is the better choice for most knee pads. Its cells are packed so tightly together that water can’t seep in, making it essentially waterproof. It’s also stronger, more tear-resistant, and holds its shape over time. EVA foam (the material in yoga mats and flip-flop soles) is a common closed-cell option that’s easy to cut and widely available.
Open-cell foam, like standard cushion foam, is softer and bounces back quickly after compression. But it can shrink over time depending on conditions, and it absorbs moisture unless you specifically choose a “dryfast” variety designed for outdoor use. For knee pads you’ll wear on wet ground or wash frequently, stick with closed-cell foam. A thickness of half an inch to three-quarters of an inch hits the sweet spot between protection and mobility. For hard surfaces like concrete or tile, go up to one inch.
Measuring and Cutting Your Pattern
Start by measuring your leg in two places: around your thigh about 4 inches (10 cm) above the center of your kneecap, and around your calf. These two measurements determine how the knee pad wraps around your leg and where the straps need to sit. For reference, an average adult thigh measurement at that point ranges from about 14 to 20 inches, with calves running roughly 11.5 to 17 inches.
For a simple rectangular knee pad (the easiest design to sew), cut two fabric pieces at 22 by 9 inches each. This gives generous coverage over the kneecap with enough material for seam allowances. Cut your foam insert slightly smaller, around 20 by 7 inches, so it fits inside the finished pocket without bunching at the seams. If you want a more contoured shape, trace a rounded rectangle or oval onto cardboard first, test it against your knee, then use that as your cutting template.
Assembling the Knee Pad
The basic construction works like making a pillowcase with a foam insert and straps sewn into the seams.
- Prepare the straps. Cut two lengths of 1-inch or 1.5-inch elastic, each long enough to wrap around your leg at the strap position plus a few inches of overlap. Sew hook-and-loop fastener (the kind sold at any fabric store) onto each end so you can adjust the tightness. Alternatively, for a simpler design, form each elastic piece into a fixed loop sized to your leg.
- Position the straps. Place one fabric piece right-side up. Position your elastic straps in loops at the top and bottom short edges, with the loops pointing inward and all raw edges lined up with the fabric edge. Stitch each strap in place at a quarter inch from the edge to hold it temporarily.
- Sew the shell. Place the second fabric piece on top, right sides facing each other, sandwiching the straps between the layers. Sew three sides together at a half-inch seam allowance, leaving one short end open.
- Turn and insert. Turn the whole thing right-side out through the open end. Slide your foam insert inside, pushing it flat into the corners.
- Close the opening. Fold the raw edges of the open end inward and topstitch it closed. For a cleaner finish, use a ladder stitch by hand.
If you want to be able to remove the foam for washing, leave the opening a bit wider and add a flap with hook-and-loop closure instead of sewing it shut permanently.
Keeping Knee Pads From Sliding
The most common frustration with knee pads, homemade or store-bought, is slipping. There are a few ways to solve this. The simplest is adding silicone grip tape to the inside top and bottom edges of the pad. Fabric and craft stores sell both iron-on and sew-on varieties. A strip along the upper and lower inside edges creates enough friction against your skin or pants to keep the pad anchored.
Strap tension matters too. Elastic that’s too loose lets the pad drift; elastic that’s too tight cuts off circulation. When you size your straps, aim for a snug fit where you can slide one finger underneath comfortably. Placing straps both above and below the knee, rather than relying on a single strap, dramatically reduces movement. If you’re using hook-and-loop closures on adjustable straps, make sure you have at least 3 inches of overlap area so the connection holds under stress.
Adapting the Design for Different Uses
The basic rectangular pad works for gardening, housework, and light tasks. For heavier-duty use, a few modifications make a big difference.
For construction or flooring work, add a second layer of foam or swap in a denser, firmer foam. You can also sew a pocket on the outside of the shell and slide in a thin piece of hard plastic (cut from an old cutting board or a sheet of HDPE) to create a hard cap that distributes impact and resists punctures from debris. Commercial knee pads designed for construction use this same layered approach: a hard outer cap, dense foam underneath, and a soft liner against the skin.
For sports or skating, prioritize a contoured fit over the flat rectangle. Trace the shape of your knee while it’s slightly bent, adding about an inch of margin on all sides. Use a stretchy outer material like neoprene (wetsuit fabric), which conforms to movement better than stiff Cordura. Adding darts, which are small triangular folds sewn into the fabric, at the top and bottom edges helps the pad curve around your leg instead of sitting flat.
For gardening on wet ground, use closed-cell foam and a waterproof outer fabric like vinyl or coated nylon. Skip open-cell foam entirely, as it’ll soak up moisture and stay damp for hours. You can simplify the design to a kneeling mat style: just two layers of fabric sewn around a thick foam pad, no straps needed, that you place on the ground rather than wear.
Reinforcing for Longevity
The seams are the first thing to fail on a homemade knee pad. Reinforce them by sewing each seam twice, once at your half-inch seam allowance and a second pass at a quarter inch. Where the straps attach, stitch a small box pattern (a square with an X through it) instead of a simple straight line. This distributes the pulling force across a wider area and is the same technique used on backpack straps and climbing harnesses.
If you’re using Cordura or other synthetic fabrics, seal the cut edges with a lighter flame or a dab of fray-check liquid to prevent unraveling. For cotton or canvas, a zigzag stitch along the raw edge before assembly does the same job. The strap attachment points take the most abuse, so consider adding a small square of extra fabric as a reinforcement patch on the inside at those spots before you sew everything together.