Foot Care & Blister Prevention for Hiking: Hot Spots, Taping, Dry Feet

Before you read on

How do blisters form? Friction, moisture and heat

A blister is not simply skin rubbed away. When a boot and sock move against the skin again and again, the outer skin layer grips the sock while the deeper layers move with the bone. The layers shear against each other, the area gets warm and red – the hot spot – and if the rubbing continues they separate. Fluid fills the gap, and the outer skin becomes the roof of a blister.

Three conditions make this much more likely, and every prevention method works on one of them:

Everything else feeds into these three: new or badly fitting boots, a fold in the sock, a seam in the wrong place, grit in the boot, a heavy pack (see the pack weight calculator), long descents and feet that have not walked far for months. Wet feet are a special case – they are covered further down in the section on cold, wet feet.

Where blisters usually start

The place tells you the cause. A blister at the back of the heel almost always means the heel lifts in the boot – a lacing or fit problem. Blisters on the toe tips mean the foot slides forward downhill. Pressure on the side of the big toe joint or the little toe means the boot is too narrow there. Fixing the cause is better than taping the same spot every day.

Fit and lacing: stop the foot sliding

Most blisters are prevented before the walk starts. A boot or trail shoe should hold the heel firmly while the toes have room to move. Try footwear on in the afternoon, when feet are larger, with your own hiking socks. As a rule of thumb you need about a thumb's width (roughly 1–1.5 cm) in front of the longest toe. The fit tests and the choice between boots and trail shoes are explained in detail in the footwear fit guide.

New footwear needs to be broken in on short walks before it goes on a multi-day trip. Use those walks as a test: take the boots off afterwards and look for red patches, because a red patch after two hours is a blister after six.

Heel lock lacing step by step

The heel lock (also called lace lock or surgeon's lock) uses the top eyelets to pull the boot back against the ankle. The heel stays in the heel cup on climbs, and the foot cannot slide forward on descents. It is the single most useful lacing trick against heel and toe blisters.

Lacing is not something you do once in the morning. Tighten the top before a long descent and loosen it a little for a long, flat stretch or when the feet swell in the afternoon. Pressure on top of the foot is relieved by window lacing – skipping one cross over the sore spot. If the heel still lifts with a heel lock, the boot may be too long or too wide; a thicker sock or a different insole can help, a different boot helps more. Trekking poles take some load off the feet on steep descents, too.

Socks and liners for blister-free feet

Socks are the layer between skin and boot, and they do three jobs: cushion, move sweat away and take some of the friction. Wool or wool-blend hiking socks are the standard because they stay warm when damp and cushion well; synthetic socks dry faster. Cotton socks hold sweat against the skin, go hard and lumpy and are a common reason for blisters on longer walks.

A liner sock under the hiking sock is worth trying if you blister easily. It adds a sliding layer, and it is quick to wash and dry at camp. Test the combination on a day walk first: two socks take up room, and a boot that was right with one sock can become too tight with two – which causes the problems you wanted to avoid.

• No folds: pull socks up smoothly, heel in the heel pocket. A wrinkle under the foot is a blister in the making. Check again after the first hour.
• Two pairs in rotation: wear one pair, carry the other drying on the outside of the pack in good weather. Swap at lunch on long, sweaty days.
• A dry pair for the night: keep one pair of socks only for camp and sleeping, packed in a waterproof bag (dry bags and waterproof packing).
• Worn socks out: a thin, felted heel or a darned lump is a friction point. Retire those socks to camp use.

Whether to use foot powder or an anti-friction balm is a matter of preference; some walkers find that balm helps on very long days, others that it makes the skin softer. Try anything new at home or on short walks, never for the first time on a long trip. For the rest of the clothing system see bushcraft clothing.

Hot spots: why you stop at the first warning

A hot spot is a patch that feels warm, rubbing, burning or stinging. It is the moment when a blister can still be prevented completely. The temptation is always to walk on "to the next junction" or "until lunch". That half hour of rubbing is usually exactly what turns a red patch into a fluid-filled blister. The rule that experienced walkers and group leaders keep is simple: whoever feels a hot spot says so, and the group stops.

On long days, plan a short break with boots off every two to three hours even without a problem – a rule of thumb that gives feet time to cool and dry, and gives you a chance to check them. Children rarely say "hot spot"; ask them at every stop and look at their feet at lunch (bushcraft with kids). In a group, make foot checks part of the routine at breaks, as described in leading group trips.

How to tape a hot spot properly

Tape works by taking the friction: the sock slides over smooth tape instead of dragging the skin. It only works when it stays flat and stays on. Most taping fails for three reasons – damp skin, square corners that catch the sock, and wrinkles that create a new pressure point.

Pre-taping known spots

If you always get a hot spot in the same place – the back of the heel for many people – tape it in the morning before you put socks on, on clean, dry skin. That is not a substitute for fixing the fit, but on a multi-day trip it saves a lot of trouble. Toes are taped with narrow strips, loosely around the toe and never in a tight ring, because swelling during the day can turn a tight ring into a tourniquet.

Take the tape off carefully in the evening, slowly and close to the skin, unless it is a hydrocolloid plaster or the skin underneath has broken. Tape left on overnight keeps the skin damp. Check the skin, let it breathe, and re-tape in the morning.

Blister first aid: intact or open?

Once a blister has formed, the aim is to protect it, keep it clean and stop the rubbing. The approach matches the blister care in our first aid kit guide: keep an intact blister closed, clean and cover an open one, and watch for infection.

Should you pop a blister?

In general, no. An intact blister protects the raw skin underneath, and every hole is a way in for germs. Some first aid courses teach that a very large, tense and painful blister that will clearly burst anyway may be drained through a small hole at its edge with a sterile needle, leaving the roof in place and covering it afterwards. Only do this if you have learned it and can keep it clean – never with an unsterile pin, never by cutting the roof away, and not at all if you have diabetes or poor circulation.

Keep the blister care in a small, waterproof pouch at the top of the pack or in a hip-belt pocket, so you do not have to unpack everything for a five-minute stop. Clean water for cleaning a wound comes from your bottle – see water purification if you refill from streams.

Drying feet and socks at camp

The evening decides how your feet start the next day. Skin that stays damp overnight is soft, tears easily and is the starting point for both blisters and the cold injuries described below. The camp routine takes ten minutes and belongs right after the shelter is up.

Wear camp shoes or light sandals in the evening (camp comfort) so feet and boots can both dry. Wet socks dry on a line under the tarp in a breeze, or overnight in the sleeping bag foot box or an inner jacket pocket if they are only damp. Very wet socks are wrung out first.

Never dry boots, insoles or socks right next to a fire or stove. Leather cracks, glue fails, synthetic socks melt, and wool scorches long before you smell it. At a fire, keep them at a distance where your hand feels only pleasant warmth – about an arm's length at the side – and keep the fire itself at least 5 m from tents and hammocks. More on boot care at camp is in the footwear guide.

Cold, wet feet and trench foot

On rainy trips, in bogs, on canoe trips and after stream crossings, feet can be wet for most of the day. A few hours of wet feet are uncomfortable but harmless: the skin goes white and wrinkled and blisters more easily. Feet that stay wet and cool for many hours or days, however, can suffer a non-freezing cold injury well above 0 °C – trench foot, also called immersion foot.

Signs are cold, numb, pale or blotchy skin, tingling, swelling and pain when the feet warm up again. The first aid matches our guide to hypothermia and cold injuries:

If the whole person is cold, wet and shivering, treat that first – the hypothermia guide explains how. In frost, cold feet can also mean frostbite, which is treated differently; the same guide covers it.

Preventing trench foot on wet trips

• Dry socks at least once a day and every night, without exception.
• Air the feet at every longer break, even in drizzle under a tarp, and dry them with a cloth.
• Lace loosely enough that blood can flow; tight boots on cold feet are a bad combination.
• Accept wet feet by day, guarantee dry feet by night – the usual strategy on very wet trips, see camping in the rain.
• Keep waterproofs working: washing and reproofing keeps gaiters and boots shedding water longer.

In snow and frost, room in the boot, insulation under the foot and dry spare socks keep feet warm; see moving through snow.

Toenails: trim straight, avoid black toes

Toenails cause more trip-ending pain than most people expect. A nail that is too long hits the front of the boot with every step downhill; a nail cut too deep at the corners can grow into the skin.

• Trim a few days before the trip, not the night before, so any sore edge can settle.
• Straight across, roughly level with the tip of the toe; smooth sharp edges with a file.
• Black or bruised toenails after long descents mean the toes are hitting the front of the boot: check boot length and use a heel lock before the descent.
• Painful pressure under a nail, an ingrown nail or a red, swollen nail fold belong to a doctor or a qualified foot-care professional. Do not drill or cut at them in the field.

A small foot-care kit for every trip

A foot-care kit fits into a small zip bag and weighs very little. Keep it within reach – in the lid or hip-belt pocket – and check it before every trip. Bigger items such as sterile dressings and gloves live in the main first aid kit.

On longer trips add more tape and plasters than you think you need – foot care is what runs out first in a group. The bushcraft kit list and the Kit Builder show where the kit fits into your pack, and a needle and strong thread from the repair kit keep a torn insole or boot seam going until you get home.

Planning for happy feet: distance, pace and groups

Feet are part of route planning. Distance and descent cause more blisters than anything else, especially at the start of a trip when the feet are not used to the load. Start with shorter days and increase them; the hiking time calculator gives a realistic time for distance and ascent, and the trip planning guide shows how to build in breaks and bail-out options.

Hot weather makes feet swell and sweat; plan longer breaks and more sock changes (hot weather). In groups, the slowest feet set the pace: a single blistered person can turn a day into a long one, so foot checks at breaks are a group habit, not a personal weakness. A first night out close to home, as in your first night out, is a good test of boots, socks and routine before a longer trip.