Shoe lifts are inserts or modifications that add height inside or outside a shoe. They range from simple foam wedges you slip into your sneakers for an extra inch to medical-grade corrections prescribed for people whose legs are different lengths. Most removable lifts add between 1 and 3 inches, while shoes engineered with built-in lifts can add up to 5 inches.
Types of Shoe Lifts
Shoe lifts fall into three broad categories, each suited to different needs and budgets.
Removable heel inserts are the most common and affordable option. These wedge-shaped pads sit under your heel inside an existing shoe. They’re typically made of foam, silicone, or rubber, and most add 1 to 3 inches of height. Many are stackable, so you can adjust the height by adding or removing layers. Because they only elevate the heel, they change the angle of your foot inside the shoe, which can make some footwear feel tighter or less stable at higher thicknesses.
Full-length insoles raise the entire foot rather than just the heel. These distribute the height increase more evenly and tend to feel more natural when walking, though they require shoes with enough interior volume to accommodate the added bulk. They’re a better choice if you plan to wear them for long periods.
Elevator shoes are designed from the ground up with a hidden lift built into the midsole. Every component, from the outsole to the interior platform, is engineered to support the added height while looking like a normal shoe. They typically provide 2 to 5 inches and feel more stable than aftermarket inserts because the lift is integrated into the shoe’s structure rather than wedged inside it.
Medical Uses for Shoe Lifts
Beyond cosmetic height, shoe lifts play a real role in orthopedic care. The most common medical reason is correcting a leg length difference, sometimes called limb length inequality. Mild cases are defined as differences under about 30 mm (roughly 1.2 inches), moderate cases fall between 30 and 60 mm, and severe cases exceed 60 mm.
Not every difference needs correction. Many clinicians consider anything under 20 mm clinically insignificant, though some evidence suggests that correcting differences as small as 10 mm can be beneficial. When correction is needed, lifts under about 10 mm (roughly 3/8 of an inch) can usually fit inside a shoe. Anything taller than that is generally added externally, because most shoes simply can’t accommodate both a thick insert and a foot. External lifts involve adding material to the midsole or outsole of the shoe itself, which a pedorthist or cobbler can do permanently.
An uncorrected leg length difference can gradually shift your posture, tilt your pelvis, and load your joints unevenly. A properly sized lift brings the pelvis closer to level and distributes weight more symmetrically across both legs.
Treating Achilles and Heel Pain
Heel lifts are also used therapeutically for Achilles tendon problems. During walking, the Achilles tendon repeatedly compresses against the heel bone, and in people with insertional Achilles tendinopathy, that compression causes pain and can damage the tendon at its attachment point. A heel lift reduces this compression by limiting how far the ankle bends upward with each step, effectively taking strain off the tendon.
Research published in the Orthopaedic Journal of Sports Medicine found that a 20 mm lift significantly increased the angle between the tendon and the heel bone, creating more space and reducing painful contact. Participants also rated the 20 mm lift as the most comfortable shoe fit among several options tested. The lift resulted in an immediate decrease in pain and symptoms, likely because it physically separates the tendon from the bone during standing and walking.
Similar logic applies to plantar fasciitis and other heel-related conditions. Elevating the heel shifts body weight slightly forward, reduces the stretch on structures along the bottom of the foot, and can provide short-term relief while the underlying issue is treated with strengthening exercises or other therapies.
How Lifts Affect Your Gait
Adding height under your heel changes the way you walk, and the effects scale with thickness. A systematic review of biomechanical studies found that even a 10 mm lift shortened the swing phase of walking, meaning the foot spends less time in the air between steps. At 5 cm (about 2 inches), walking speed dropped noticeably.
During running, lifts of 12 to 18 mm shortened the calf muscle-tendon unit and reduced how far the ankle could flex. That’s precisely the mechanism that helps with Achilles pain, but in a healthy runner it could limit natural range of motion over time. If you’re using lifts purely for height, keeping the thickness modest (under about 1 inch) minimizes these biomechanical tradeoffs.
Materials and What to Expect
The material a lift is made from determines how it feels day to day and how long it lasts.
- EVA (foam): Lightweight with excellent shock absorption. Thousands of tiny air bubbles cushion each step, reducing the jarring impact on hard surfaces. The downside is that EVA compresses over months of daily use, gradually losing its cushioning and arch support. Plan to replace foam lifts every few months if you wear them regularly.
- Silicone and rubber: Denser and more durable than foam. Rubber holds its shape under pressure and provides consistent support without flattening out. The tradeoff is less immediate cushioning, which can lead to heel soreness during long periods of standing.
- Cork: A natural option with good shock absorption and breathability. Cork gradually molds to the shape of your foot over time, creating a custom fit that improves with wear. It’s less tough than rubber, sometimes has an uncomfortable break-in period, and may need occasional maintenance to stay in good condition.
For occasional cosmetic use, inexpensive foam or silicone inserts work fine. For daily wear or medical correction, cork or denser rubber holds up better and provides more stable support. If you need a lift taller than about 10 mm for a leg length difference, an external modification to the shoe’s sole is more practical and more stable than stacking inserts inside the shoe.