Tsujimoto Market: Our Guarantees
Description
Hiyear Ice Neck Ring — 28 °C Phase-Change Cooling Collar, Reusable
Overview
A closed loop worn around the neck, filled with a phase-change material that freezes at about 28 °C. That number is the whole design. When the filling melts at 28 °C it absorbs a large amount of heat and stays at 28 °C until it has finished melting, so the ring gives steady, mild coolness instead of the sting of ice — and because 28 °C is above the dew point in most conditions, it does not sweat condensation down your collar.
What it is and is not. It is a comfort item for hot weather: it makes standing in the sun more bearable and it is pleasant against the neck. It is not a medical device and it does not treat or prevent heat illness. If someone is confused, has stopped sweating, is vomiting or has collapsed in the heat, that is a medical emergency — get them into shade, cool them actively and call for help.
See also: Japanese health and comfort goods, household goods from Japan.
Key Benefits
- ✓ Sets at about 28 °C — cool against the skin without the burn of an ice pack
- ✓ Re-freezes on its own below about 26 °C ambient; no freezer needed if the room is cool
- ✓ Freezer roughly 10 minutes, fridge about 20, cold water about 15–30 when you are in a hurry
- ✓ Around one to two hours of wear outdoors at 25–40 °C
- ✓ No condensation, so it does not drip down your collar or mark a shirt
- ✓ No batteries, no cable, no fan noise — nothing to charge and nothing to break
- ✓ Reusable indefinitely; it is one sealed loop with no consumable part
- ✓ About 120 g, light enough to forget you are wearing it
Product Details
| Brand | Hiyear |
|---|---|
| Country of origin | Japan; made for the Japanese domestic market |
| Product type | Phase-change cooling neck ring |
| Set point | About 28 °C |
| Outer material | TPU |
| Filling | Phase-change material (PCM) |
| Weight | About 120 g |
| Tube diameter | About 20 mm |
| Time to set | Freezer about 10 min; fridge about 20 min; cold water about 15–30 min |
| Wear time | About 1–2 hours outdoors at 25–40 °C |
| Power | None. No batteries, no charging |
| Size | A fixed loop; it does not adjust. The circumference is printed on the pack — message us before ordering and we will confirm what we hold |
Who Is This For?
- Anyone who commutes, queues or waits outside in a Japanese summer and wants the walk to be bearable
- Golfers, anglers, cyclists, hikers and spectators — anything that keeps you outdoors and standing
- People who cannot use an ice pack against bare skin without it hurting
- Anyone who wants cooling without a fan's noise or a battery to charge
- Not a treatment or a preventive for heat illness, and not a substitute for shade, water and rest
How to Use
- If the filling is already solid, just put the ring on — there is nothing to prepare.
- If it is liquid, set it: about 10 minutes in the freezer, about 20 in the fridge, or about 15–30 minutes in cold water.
- Rest it around the neck so it sits on the collarbones. It should not be tight.
- Wear it over a thin collar if you find bare-skin contact too cool at first.
- When it softens through, set it again. Two rings alternated will cover a whole day out.
- Wipe it with a damp cloth and dry it before putting it away.
Frequency: As often as you like through the hot season; set it again each time it softens through
Materials and Construction
Shell. TPU, a flexible polyurethane, sealed into a closed loop of roughly 20 mm tube. There is no zip, no valve and no refill port: the filling never leaves.
Filling. A phase-change material with a melting point of about 28 °C. A phase-change material is one that absorbs or releases a large quantity of heat while it changes state, at a nearly constant temperature — which is the property being used here. While the filling is melting, the ring stays close to 28 °C and keeps absorbing heat from you; once it has melted through, it stops, and that is what the one-to-two-hour figure describes.
Why 28 °C rather than 0 °C. Ice is roughly 28 degrees colder than skin, which is why an ice pack hurts and why it has to be wrapped. A 28 °C set point is cool against the neck but never cold enough to cause a cold burn, so it can be worn straight on bare skin for as long as it lasts — and it is warm enough to stay above the dew point in most weather, which is why it does not drip.
Weight. About 120 g in total.
Cautions
- This is not a treatment for heat illness and it does not prevent one. Confusion, hot dry skin, stopping sweating, vomiting or collapse in the heat are a medical emergency: move the person into shade, cool them actively and call for help. Do not rely on a neck ring.
- Shade, drinking water and rest do the work. This makes the heat more comfortable; it does not make it safe.
- Do not put it in a microwave, in boiling water, or on a radiator. Do not pierce, cut or try to open it.
- Do not leave it in a freezer for hours. It is designed to set in minutes, and prolonged deep-freezing makes the loop hard and unpleasant against the neck.
- Do not use on broken, irritated or sunburnt skin.
- Children should use it only with an adult watching. Any closed loop worn around the neck carries a risk if it catches on something.
- Not for anyone who cannot remove it unaided, or who cannot feel temperature normally on the neck.
- If the shell splits, stop using it and throw it away. Do not swallow the contents; if the filling is swallowed, seek medical advice.
Package Contents
One cooling neck ring. No case, cooler bag or spare is included. If you want cover for a full day outdoors, two rings alternated is the arrangement that works.
Shipping & Store Notes
- Ships directly from Japan
- Processing time: 2–6 business days
- Tracking number provided after dispatch
- Import duties and taxes may apply depending on destination country
- Returns are accepted only on an unused item in its original packaging
Authenticity Guarantee
Every product at Tsujimoto Market is sourced directly from Japan and verified for authenticity. We never sell fakes or grey-market goods. Each order is carefully packed in Kobe, Japan and dispatched with full tracking.
FAQ
Does it prevent heat stroke?
No, and we will not say that it does. It is a comfort item: it makes hot weather more bearable and feels good on the neck. Heat illness is prevented by shade, fluids, rest and getting out of the sun, and heat stroke itself is a medical emergency. A page that implies otherwise is a page that could delay someone doing the thing that actually helps.
Why 28 °C? Would colder not be better?
Colder would be briefly more dramatic and then worse. Ice is about 28 degrees below skin temperature, which is why an ice pack stings and has to be wrapped. At 28 °C the ring is cool but cannot cause a cold burn, so it can sit straight on the skin for its whole working life — and it stays above the dew point in most weather, so it does not condense and drip down your collar.
How do I re-freeze it, and how long does it last?
About ten minutes in the freezer, about twenty in the fridge, or about fifteen to thirty minutes in cold water. Below roughly 26 °C ambient it sets on its own with no help at all. Expect one to two hours of wear outdoors between 25 and 40 °C — hotter days are at the short end of that.
Will it drip or leave a wet mark on my shirt?
It should not. Because the surface sits near 28 °C rather than near zero, it stays above the dew point in most conditions and does not gather condensation the way a frozen gel pack does. In very humid weather straight out of a freezer you may see a little, which wipes off.
Does it come in different sizes, and which one is this?
The ring is a fixed loop and does not adjust, and rings of this type are made in more than one circumference. The size is printed on the pack of the one we hold — message us before ordering and we will confirm it, rather than have you guess.
