Cold feet aren't just uncomfortable — they delay sleep onset. Warming the extremities drives blood flow to the surface of the skin, which helps the core body temperature drop in the way sleep requires. Electric heated socks need charging. Thick wool socks are bulky. The THERM's tourmaline-infused sole generates gentle warmth from foot contact and movement alone — no batteries, no charging, no electronics — just consistent mineral warmth from the first time you put them on.
Tourmaline warmth. No batteries. No charging.
- TOURMALINE SELF-HEATING — NO POWER REQUIRED: tourmaline-infused fibers in the sole panel generate mild warmth through compression and movement against the skin. The mineral produces far-infrared radiation that warms the foot gently and consistently — the effect builds within 10–15 minutes of wear and requires no electricity, no batteries, and no charging. Works from the first night.
- ACUPRESSURE-POINT STIMULATION: the magnetic fiber arrangement in the sole applies targeted gentle pressure on acupressure points under the foot during wear. Traditional foot-point stimulation is associated with circulation improvement, leg fatigue relief, and relaxation — the THERM delivers this as a passive benefit of normal wearing.
- POLYESTER-COTTON KNIT — COMFORTABLE ALL NIGHT: the body of each sock is a soft polyester-cotton blend knit — comfortable against the skin during both daytime wear and overnight use. Mid-calf height provides coverage without restricting calf circulation. At ~40g per sock, they're light enough not to feel heavy on the feet during sleep.
- HAND-WASH ONLY — PRESERVE THE MINERAL EFFECT: the tourmaline-infused fibers retain their self-heating properties longer when hand-washed under warm running water without detergent. Machine washing and detergent degrade the mineral coating faster — hand-wash preserves the effect for more wears per pair.
Warming the extremities causes peripheral vasodilation — the skin temperature rise that signals the brain it's time to sleep by helping core body temperature drop.
minutes until the tourmaline warming effect is noticeable during wear — consistent gentle heat, no peak-and-fade
per sock — light enough to wear overnight without heaviness on the feet
batteries, charging, or electronics required — warmth comes from the mineral-infused sole panel
Peripheral vasodilation and sleep onset: Journal of Sleep Research. Far-infrared radiation and circulation: International Journal of Biometeorology. Customer survey: Calena THERM users, 60-day trial.
Why warm feet improve sleep onset
Warming the feet and extremities causes blood vessels near the skin surface to dilate — drawing warm blood toward the surface and away from the core. This peripheral vasodilation is part of the body's natural sleep preparation process, helping core temperature drop to the level required to initiate sleep onset.
Cold extremities signal the sympathetic nervous system to conserve heat by constricting peripheral blood vessels — maintaining alertness and delaying the thermoregulatory shift that precedes sleep. Warm feet remove the cold-extremity signal and allow the body to initiate its natural wind-down sequence.
Far-infrared radiation from tourmaline-infused materials is associated with improved local circulation and the relief of leg and foot fatigue. For people on their feet all day, consistent mild warmth and acupressure stimulation through the THERM's sole panel supports circulation recovery during overnight wear.
For anyone whose cold feet are the last thing standing between them and sleep.
The cold-feet sleeper
Your feet are always cold at bedtime. You lie there waiting for them to warm up and it takes 20–30 minutes before you can actually relax.
THERM's tourmaline sole panel warms the foot within 10–15 minutes of wear — no waiting, no electric heating element, just consistent mineral warmth from the first night.
The cold-extremity sufferer
Cold hands and feet are your baseline — year-round, not just winter. You've tried thick socks but they're too hot for sleeping and too bulky for daytime.
THERM's mid-calf knit is light enough for everyday and overnight wear — not thick-and-bulky winter weight, but genuinely warming through the tourmaline panel.
The on-your-feet-all-day person
By the end of a long shift or a standing day, your feet are tired, sore, and swollen. You need something that helps recovery without active effort.
The acupressure-point stimulation in the THERM sole provides passive circulation support and foot-fatigue relief during wear — recovery while you go about your day.
The circulation-aware person
You have poor circulation in your extremities. Doctors recommend movement and warmth. You want a wearable solution that works passively.
Tourmaline far-infrared warmth supports local circulation improvement. Wear the THERM during the day or overnight — consistent gentle warmth without active intervention.
The practical gift-giver
You want to give something genuinely useful that the recipient will use every day — not a gadget, not something that needs charging.
A 3-pair set of self-heating wellness socks is the gift that gets used every single day. No batteries to run out, no charging to forget. Practical, daily-use, nightly value.
Put them on. Feel the warmth within minutes.
Put Them On
Pull the THERM socks on and adjust to comfortable mid-calf height. The tourmaline-infused sole sits against the bottom of your foot. Wear around the house, to bed, or during your day.
Tourmaline Sole PanelFeel the Warmth Build
Within 10–15 minutes of wear, you'll notice a mild warming sensation building from the sole — consistent and gentle, not space-heater hot. The warmth continues as long as you're wearing them.
Self-Heating Mineral WarmthHand-Wash to Preserve
After wearing, hand-wash under warm running water without detergent. The tourmaline mineral coating lasts longer without detergent exposure. Air dry before storing or wearing again.
Hand-Wash OnlyElectric heating socks need charging. THERM generates warmth from the mineral in the sole.
| Standard thick wool socks | Calena THERM | |
|---|---|---|
| Tourmaline self-heating sole | ✕ | ✓ |
| No batteries or charging needed | ✕ | ✓ |
| Acupressure-point stimulation | ✕ | ✓ |
| Light enough for overnight wear | ✕ | ✓ |
| Reusable — hand-wash and rewear | ✕ | ✓ |
| 30-day money-back refund | ✕ | ✓ |
Try it risk-free.
30-Day Money-Back Guarantee
Not satisfied within 30 days? Return it for a full refund — no questions asked. No hoops, no hassle.
1-Year Warranty
Every Calena product is backed by a full 12-month warranty against defects.
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We're so confident you'll love this product, we're giving you 30 days to test it. If it doesn't work for you, send it back for a full refund.
Everything you need to know about THERM.
How long does shipping take? +
Orders ship within 1–2 business days and typically arrive within 5–7 business days in the US. You'll receive a tracking link as soon as your order ships.
What's your return policy? +
We offer 30-day returns on all products. If you're not satisfied for any reason, contact us and we'll arrange a full refund — no questions asked.
Is the product safe and non-toxic? +
Yes. All Calena products are tested for safety and free from harmful chemicals. We only use materials we'd use in our own homes.
How is this different from a cheaper version on Amazon? +
Most cheap alternatives use low-grade materials that degrade quickly and have no scientific basis for their claims. Calena products are anchored in studied mechanisms, built from premium materials, and backed by real guarantees.
Where do you ship from? +
All orders are fulfilled from within the USA for fast, tracked delivery.
What's covered under the warranty? +
Every Calena product is covered by a 1-year warranty against manufacturing defects. If something is wrong, contact us and we'll make it right.