The cool you feel comes from cold receptors, not from analgesia. The warm comes from blood-vessel dilation, not from magnesium absorption. The shift comes from ten minutes of stillness, not from a miracle ingredient. Three honest mechanisms, calibrated to stay safe and sub-monograph.
Vasodilation. Parasympathetic downshift. Local muscle recovery.
Warm immersion raises core temperature, which dilates blood vessels in the skin and underlying tissue. Blood flow increases. Lactate clears faster from sore muscles. Tight tissues get more nutrients, more oxygen, more recovery substrate.
Your nervous system shifts modes. Hot water activates the parasympathetic branch, the rest-and-digest side. Heart rate drops. Cortisol drops. Sleep onset becomes easier. Same effect as a sauna, but isolated to the parts that hurt.
This is the boring part. It's also the most-supported part. No herb, no salt, no ritual changes the fact that 38 to 40°C immersion for 10 minutes produces measurable autonomic shifts.
TRPM8 cold-receptor activation, calibrated sub-monograph.
Menthol activates TRPM8 receptors, the same nerve endings cold weather hits. Within 30 seconds you feel a distinct cool. After a minute you feel a warm bounce as the body responds. That's sensation. It's not pain relief in the pharmacological sense.
No menthol in Lights Out, standard cool in Dead Legs, sharp cool in Fight Night. The FDA OTC monograph for an analgesic claim sits at a specific menthol floor. We sit below it on purpose. The cool is real. The analgesic claim isn't ours to make.
| LIGHTS OUT | NO MENTHOL | No cool · sleep-side |
| DEAD LEGS | STANDARD | Noticeable cool · post-train |
| FIGHT NIGHT | SHARP | Strongest in the line · after-the-day |
Why we made this choice: the moment you cross the FDA analgesic floor on a label, you're in OTC drug territory. We didn't want to be a drug. We wanted to be a bath that feels like one without lying about what it is.
No phone, no scroll, no email. Just heat on the sore parts.
Ten minutes of stillness with hot water on the sore parts of your body reframes the rest of the day. You sleep better. You wake up looser. The autonomic shift compounds with the heat and the menthol cool, but it only happens if you stop moving.
We're not curing anything. We're helping your body do what it would have done anyway, better. The bath isn't the magic. The bath is the excuse to sit still for ten minutes.
If you can't put your phone down for ten minutes, no soak in any bath aisle will help you. If you can, this one will help you more than most.
Every active named. No proprietary blends. No "natural complex." No fillers we hide.
Magnesium sulfate USP. The base of every sachet. We do NOT claim transdermal magnesium absorption (it's a myth, see Gröber et al. 2017). Epsom is here because warm-water dissolved Epsom feels right and softens the water. That's it.
USP-grade L-menthol crystals. Triggers TRPM8 cold receptors. Held below the FDA OTC analgesic monograph threshold, by design. We don't claim pain relief. We claim cool.
The humectant workhorse. Pulls water into thick, rough skin and holds it there while you soak. In Cracked Earth it leads, heavy. In Dead Skin it supports. The soak softens; the smoothing happens after, on the stone.
Jhama, the traditional Indian foot stone, natural pumice. The soak softens what's built up; the stone takes it off. The smoothing is mechanical, after the water has done the prep. Soak it soft, stone it smooth.
Oat, ground fine. Soothes irritation and calms what the heat stirs up. The single most boring and most evidence-backed thing in the formula.
Per-SKU scent profiles (eucalyptus, peppermint, vetiver, lavender, cedarwood, bergamot FCF) at cosmetic concentrations. Glycerin as a humectant carrier. No artificial fragrance, no parabens, no sulfates.
Three claims every other bath-soak brand makes that we refuse to.
"Boosts your magnesium levels."
Gröber et al. 2017 (Nutrients, vol 9, issue 8) reviewed the transdermal magnesium literature and concluded the evidence doesn't hold up. Most bath salt brands still print this claim. We refuse. The Epsom in our sachets is for water softening and sensation, not systemic magnesium delivery.
"Relieves muscle pain."
Pain relief is a drug claim that requires either FDA monograph compliance (an analgesic-floor menthol load on the label) or an approved drug application. We sit below the monograph threshold on purpose. The cool you feel is sensory. Whether that helps your soreness is a personal experience question, not a clinical claim.
"As seen in [unverified publications]."
We haven't been seen anywhere yet. Pre-launch brands that print this on day one have invented their own press. When we are seen somewhere, we'll cite the publication, the date, and the journalist. Until then, the press section stays empty.
Six soaks, two per door. Ten minutes each. Hand-made in Toronto, made to order.
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