I'm the guy who reads the footnotes. When I shop for anything over a few thousand dollars, I assume the feature list is 80% marketing and 20% substance, and my job is to figure out which 20%. So when I started looking at infrared saunas, I approached every bullet point on the product page with a raised eyebrow.

"Full-spectrum infrared." "Medical-grade red light." "Smart WiFi app control." "Lifetime warranty." To me, that read like a checklist someone wrote to justify the price. I figured half of it was fancy words for a hot wooden box.

Then I actually bought one — a Peak, after a lot of comparing — and lived with it for a while. Some of my cynicism held up. A lot of it did not. Here's the honest breakdown of the six features I assumed were fluff, ranked by how wrong I turned out to be.

1. Full-Spectrum Infrared — I was most wrong about this one

I assumed "full-spectrum" was a way to charge more for the same heat. Infrared is infrared, right? Not quite. Near, mid, and far wavelengths feel genuinely different in the body — the near feels surface-warm and immediate, the far feels like the heat is coming from inside you. On the cheaper single-band units I tried in showrooms, I'd get hot and sweaty and that was it. In the full-spectrum Peak, the sessions felt layered, and I stayed in longer without that flushed, over-baked feeling.

• Pro: The range of wavelengths made longer sessions comfortable instead of punishing.
• Caveat: You won't feel the difference in a 30-second showroom demo. It took me a couple weeks of real sessions to notice.

2. Medical-Grade Red Light Therapy — the surprise favorite

This felt like the most gimmicky item on the whole page. I pictured a novelty color-changing bulb. What Peak includes is full-body, medical-grade red light panels, and it became the part of the ritual I look forward to most. I won't pretend to know all the mechanisms — research on red light therapy is still developing — but the panels turned a functional sweat session into something that felt restorative. It's the difference between a shower and a spa.

• Pro: Full-body coverage, not a token panel. Made the whole session feel intentional.
• Caveat: Treat any big personal claims online with skepticism — go in for how it makes you feel, not for a specific number.

3. Smart WiFi App Control — I owe this one an apology

I actively rolled my eyes at this. An app? For a sauna? I assumed it'd be the kind of thing you use once and forget. In practice it's the reason I actually use the sauna consistently. I preheat it from upstairs while I finish work, walk down when it's ready, and never waste 20 minutes sitting in a lukewarm box waiting. Removing that friction is the whole game with any habit.

• Pro: Preheating remotely killed the #1 excuse I had for skipping sessions.
• Caveat: It's convenience, not magic. But convenience is exactly what makes an expensive purchase get used.

4. The Lifetime Warranty — fluff until you do the math

Warranties always read like fine print to me — full of exclusions that make them worthless. But when you're spending real money on something with heaters, panels, and electronics, a lifetime warranty changes the arithmetic. I compared it against competitors offering a few years of coverage, and the long-term cost picture flipped. A cheaper sauna with a short warranty can easily become the more expensive sauna.

• Pro: Lifetime coverage genuinely de-risks a four-figure decision.
• Caveat: Read what's covered like you would any warranty — but this one held up to my scrutiny better than most.

5. Canadian Hemlock Construction — quieter than I expected to care

I filed "premium wood" under pure marketing. It's a box you sit in. But the Hemlock is where the everyday quality shows — no chemical smell when it heats up, tight joinery, a solid feel when you close the door. It's the kind of thing you don't notice until you've been in a flimsy one and heard it creak.

• Pro: Clean, no off-gassing smell, genuinely well-built.
• Caveat: This is a "you'll appreciate it over years" feature, not a dealbreaker on day one.

6. US-Based Expert Support — the feature you hope you never test

Support quality is impossible to judge from a spec sheet, so I ignored it entirely. Then I had a setup question and got a real US-based person — I'd actually talked to Danielle, their GM, during my research phase, and the support experience matched that same human tone. After years of chatbots and overseas scripts, talking to someone who actually knew the product was its own kind of feature.

• Pro: Real people, real product knowledge, no runaround.
• Caveat: You can't verify this until you need it — but it's worth weighting more than I did.

What I'd tell my skeptical self

My instinct to distrust feature lists wasn't wrong — it's still good shopping hygiene. But I'd learned that the tell isn't whether a feature sounds premium, it's whether it changes what you actually do every day. The app got me using it. The full-spectrum heat kept me in longer. The red light made me look forward to it. The warranty let me stop second-guessing the money.

The stuff I thought was fluff turned out to be the difference between a sauna I'd have abandoned in a closet and one that became part of my week. Turns out the footnotes mattered more than I gave them credit for.