Warmers
Hand and foot warmers are single-use, air-activated heat packs that keep fingers and toes warm on cold hikes, hunts and winter commutes without batteries or charging. Picking the right warmer comes down to three factors:
- Placement — hand warmers slip into gloves or pockets, foot warmers are shaped and sized for boots.
- Duration — look for a steady 10-hour burn instead of a short, uneven spike of heat.
- Pack size — bulk packs of 20 pairs cover a full season or a group trip rather than a single outing.
How do disposable hand and foot warmers work?
Both hand and foot warmers use the same air-activated, 100% natural oxidation process: open the packet, shake it, and the eco-friendly contents start producing steady heat within minutes. There is no battery to charge and no liquid to spill — just tear the wrapper and go. A single hand warmer weighs about 10 g (0.35 oz) and is thin enough to sit flat inside a glove, pocket or mitten, while foot warmers are cut to fit inside a boot and come in two sizes, Small (EU 37–39) and Medium (EU 39–43), so check your boot size before ordering.
Terra Incognita has spent 18+ years running its own expeditions in cold climates, and its outdoor specialists curate the Haago warmer range specifically for reliable, long-burn heat rather than the short spikes of cheaper alternatives.
Hand warmers or foot warmers: which do I need?
| Type | Best for | Pack size | Weight |
|---|---|---|---|
| Hand Warmers | Gloves, pockets, mittens | 20 pairs (40 units) | 10 g per warmer, approx. 400 g (14.11 oz) per pack |
| Foot Warmers | Boots, sizes S (EU 37–39) & M (EU 39–43) | 20 pairs (40 units) | 200 g (7.05 oz) per pack |
Both packs run for up to 10 hours per warmer, so a single bulk pack of 20 pairs is enough for a multi-day trip or splitting between a group.
Warmers FAQ
How long do disposable hand warmers last?
Each warmer produces steady heat for up to 10 hours once activated by air exposure. There is no battery or recharge step involved — the natural oxidation reaction simply runs its course over that time, and once it finishes the warmer is discarded and replaced with a fresh one from the pack.
How do hand warmers get hot without a battery?
They rely on a 100% natural oxidation process. Opening the packet and shaking it exposes the eco-friendly contents to oxygen in the air, which starts a chemical reaction that produces steady heat within minutes and keeps releasing it gradually for hours rather than in one quick burst.
What size foot warmers do I need?
The Foot Warmers Bulk pack comes in two sizes: Small, covering EU 37–39, and Medium, covering EU 39–43. Check your usual boot size before ordering so the warmer sits flat under your foot without bunching, since a poor fit can affect both comfort and heat contact.
Can hand or foot warmers be reused?
No, both are single-use and disposable. Once the oxidation reaction finishes after roughly 10 hours, the chemical process is spent and the warmer stops producing heat for good, which is why they ship in bulk packs of 20 pairs to cover repeat trips through a season.
Related collections
Also worth a look: clothing & footwear, base layers, socks.