Less Sweat, Healthier Skin: What Makes the Össur AeroFit Liner Different

Reading Time: 5 minutes

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Summary:

• Össur’s AeroFit Seal-In Liner uses 3D-printed silicone with micro-holes and a breathable mesh to move sweat away from the residual limb

• Traditional silicone liners trap heat and moisture, leading to skin breakdown, suspension loss, and infection risk

• A peer-reviewed study found the AeroFit vented system significantly reduced relative humidity and improved perceived sweating during activity

• Suspension, stability, and comfort scores were comparable to standard Seal-In liners—breathability without the trade-off

• Designed for above-knee amputees across activity levels K1-K4, low to high impact

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Sweating inside a prosthetic socket is one of the most consistently reported problems among lower limb amputees, affecting comfort, skin health, and prosthetic fit across activity levels and climates. For years, the standard response has been management: moisture-wicking liner socks, antiperspirant products, and scheduled breaks to air out the residual limb. The Össur AeroFit Seal-In Liner takes a different approach, addressing the source of the problem rather than its symptoms by integrating breathability directly into the liner.

The Problem Traditional Liners Create  

Standard silicone liners support and secure the residual limb while serving as insulators. However, their lack of breathability traps heat and sweat, which remains on the skin’s surface, leading to discomfort or skin issues.

However, this isn’t just a minor inconvenience. Sweat buildup inside a liner can cause it to slide on the skin, directly affecting the prosthetic leg's suspension. Furthermore, as this condition creates more friction, the skin barrier breaks down, complicating residual limb skin health.

And the consequences show up quickly. Constant dampness can lead to fungal growth, folliculitis, slippage, and unhygienic bacterial overgrowth inside the socket. While workarounds exist, like using antiperspirant and moisture-wicking socks, they only treat the symptoms rather than the cause.

What the AeroFit Liner Does Differently  

The AeroFit Seal-In Liner combines a vented socket with a 3D-printed silicone liner. Its construction method sets it apart from traditional liner manufacturing. The 3D-printed silicone interface features micro-holes at the skin surface layer and a multidimensional breathable mesh behind it that draws perspiration away from the skin, allowing moist air to circulate within the liner and then be expelled through the ventilated socket.

This design is fundamentally different from a conventional liner. Rather than sealing moisture against the skin, the AeroFit system creates a pathway for it to evaporate—from the skin surface, through the micro-perforated silicone, into the breathable mesh layer, and out through the socket vents. The liner and socket work as a single ventilation system, not as two separate components. And the result is significantly reduced humidity accumulation and improved perceived skin health.

The Research Behind the Claim  

A peer-reviewed clinical study published in Scientific Reports tested the vented liner-and-socket system against Össur’s standard Seal-In silicone liner in a controlled, randomized crossover design.

Nine individuals with above-knee amputation who were experienced prosthetic users participated. After at least two weeks of adaptation, participants were randomized to two study arms: the AeroFit socket and liner (vented system) and the Seal-In silicone liner with the AeroFit socket with sealed vents (non-vented system). Participants then walked on a treadmill for 20 minutes.

The results were statistically significant. Relative humidity was significantly reduced, and perceived sweating, as reported by prosthesis users, improved with the vented system. Crucially, patient-reported outcomes on suspension, stability, and comfort were not significantly different between the vented and non-vented systems.

Subsequent research supports the central insight behind the AeroFit design: managing humidity—not just temperature—in the prosthetic socket results in a significant reduction in perspiration during prosthesis use, leading to perceived improvements in skin health and quality of life. That distinction between humidity and temperature is important. Prior liner innovations focused primarily on heat management; the AeroFit targets the moisture that heat generates, which turns out to be the more clinically meaningful variable.

Who It’s Designed For  

The Aero-Fit Seal-In Liner is intended for unilateral and bilateral above-knee limb loss individuals across activity levels K1 through K4, from low to high impact. This broad range of users reflects the reality that sweating inside a prosthetic socket is not a problem unique to highly active amputees; it affects people across the mobility spectrum, in both warm and cool climates, at work and at rest.

The liner is a variant of Össur’s well-known Seal-In line, so users transitioning from a standard Seal-In liner shouldn’t need to make significant adjustments to its design.

The Bottom Line  

The AeroFit Seal-In Liner’s 3D-printed silicone construction makes this level of breathability possible. Traditional manufacturing methods can’t produce the micro-holes that allow moisture to pass through without compromising prosthetic suspension.  

For lower-limb amputees who’ve spent years managing residual limb skin issues, rotating through liner socks, scheduling mid-day breaks to air out their residual limb, or avoiding physical activity because of the sweat that follows, the AeroFit represents something new: a liner that supports not only your residual limb but also your lifestyle.  

Related Reading:

Chafing Issues Solved: Techniques to Reduce Energy-Robbing Friction

Prosthetic Liner Issues? Here Are the Possible Causes, Solutions

How to Wash Your Prosthetic Liner: Keep It Comfortable, Grippy, and Skin-Friendly

Skin Care That Supports Prosthetic Comfort—and Your Confidence