Why Silver Film? — The Heating Technology Behind the LC99 Heat
If you've ever worked at a desk with cold feet, you know how distracting it can be. ROUMO chose silver — the most thermally conductive metal on earth — to solve this everyday problem. Here's why.
Cold Feet Are More Than Just Uncomfortable
Even in heated offices, the floor-level temperature is often 5–10°C lower than at desk height. Warm air rises; cold air sinks. Your feet bear the brunt of that difference.
A study by Cornell University found that when ambient temperature drops by just 5°C, typing errors increase by 44%. Cold feet don't just feel bad — they measurably reduce your focus and productivity.
That's why ROUMO built the LC99 Heat: the same ergonomic footrest, now with built-in warmth.
Why Silver?
At the core of the LC99 Heat is a Silver Film Heater. Among all heating materials, silver was chosen for one clear reason.
Silver (Ag) has a thermal conductivity of 429 W/m·K — the highest of any metal. It outperforms copper (401 W/m·K) and is roughly 1.8x more conductive than aluminum (237 W/m·K). This means heat spreads quickly and evenly the moment you turn it on.
A silver film heater consists of silver particles coated onto an ultra-thin film. Compared to traditional wire-based heaters (nichrome), the differences are significant:
| Feature | Silver Film Heater | Traditional Wire Heater |
|---|---|---|
| Heat distribution | Surface heating (uniform) | Line heating (concentrated) |
| Heat-up speed | Fast | Moderate |
| Thickness | Under 0.3 mm (ultra-thin) | Thick |
| Temperature uniformity | High | Low (hot spots near wires) |
Because heat radiates evenly across the entire surface, every part of your feet receives consistent warmth.
Three Temperature Settings, One Button
The LC99 Heat offers 40°C / 45°C / 50°C — three levels controlled by a single button on the controller.
Use 40°C for mild spring or autumn chill. Switch to 50°C on the coldest winter days. It adapts to your comfort and the season.
Triple Safety System
Safety is the top priority in any heated product. The LC99 Heat includes three layers of protection:
AUTO POWER OFF — Automatically shuts off after 4 hours of continuous use. Forget to turn it off before leaving? No problem.
OVERHEAT PROTECT — If the internal temperature exceeds 70°C, heating stops immediately, protecting both you and the device.
SMART TEMP — Intelligent temperature regulation that maintains your chosen setting without fluctuation. Steady warmth, no hot spots.
All three work simultaneously, so you can keep it under your desk all day with confidence.
Just One USB-C Cable
The LC99 Heat runs on USB-C (9V/2A, 18W). No need to hunt for a wall outlet — just plug into a desk USB port or use the included 25W adapter for optimal performance.
At only 18W, running it for a full 8-hour workday costs virtually nothing in electricity.
Dual-Sided Cover: Warm in Winter, Cool in Summer
The LC99 Heat comes with a reversible cover. One side features soft fur fabric for winter warmth, and the other uses breathable mesh for summer comfort. Flip it over with the seasons, and you have a four-season footrest — with or without the heating function.
The Same Ergonomic Design You Trust
Adding heat didn't change the core LC99 design. The height range of 5-19 cm, the 9+9 hole adjustment system (up to 81 combinations), and the tool-free knob mechanism are all unchanged. It's still light enough to reposition with your feet, moving naturally as you shift posture throughout the day.
No need to replace your desk or chair. Just add one thing under your feet.
The Bottom Line
Silver wasn't chosen to be fancy. It was chosen because it's the fastest, most uniform way to deliver heat across a surface. ROUMO set out to solve the simple, everyday discomfort of cold feet at work — and silver film heater technology was the answer.
When your legs feel right, your day feels different.
FAQ
Q. Can the silver film heater be washed?
The heating pad itself should not be washed. The cover is removable and can be hand-washed.
Q. Can I use the LC99 Heat in summer?
Yes. Simply use the mesh side of the cover and turn off the heating function. It works as a regular ergonomic footrest year-round.
Q. Is it safe from electromagnetic radiation?
The LC99 Heat is KC-certified and has passed electromagnetic compatibility testing (R-R-Pr4-PD-ROM25).
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