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Why layering beats one big coat

The fells are brilliant at throwing four seasons at you between the car park and the summit. You set off in still, mild valley air, sweat your way up a steep grass rake, then step onto a plateau where the wind is doing forty miles an hour and the rain is arriving sideways. No single garment copes with all of that. Layers do, because you can add and remove them as your body heat and the weather change — and the change is often dramatic.

The principle is simple. Your body produces a great deal of heat and moisture when you are climbing, and almost none when you stop for a sandwich on a chilly top. Good layering lets you dump heat on the way up, then trap it back in within a minute of halting. Three working layers — base, mid, shell — plus a spare warmth layer in your pack will handle almost anything a British hill can throw at you from October through to April.

Base layers: deal with sweat first

The layer against your skin has one job: move moisture away from your body so you do not sit in a damp film of your own making. Cotton is hopeless at this and dangerous on a cold day — once it is wet it stays wet and sucks heat out of you. Leave the t-shirts at home.

You want either a synthetic base layer or fine merino wool, both of which wick well and dry quickly.

• Synthetic dries fastest, feels cooler and copes well with repeated soggy days. Ideal for wet, mild-ish conditions.
• Merino is warmer for its weight, resists whiffing after a long day, and still insulates when slightly damp. Better for genuinely cold conditions.
• Thickness matters as much as material. A lightweight base for brisk climbing, a midweight one for cold, slow days or for anyone who feels the chill.

Take a spare base layer in a dry bag. Changing into a dry one at a bothy, in a car, or halfway round a long winter round can turn a miserable trudge into a pleasant day.

Mid layers: your warmth reserve

Mid layers are what you add when the climbing stops and the shivering starts. Think of them as stored warmth you can put on in seconds.

A fleece or lightweight synthetic jacket is the classic British hill mid layer. It breathes well, keeps working when damp, and is cheap enough to abuse. A grid fleece or a thin softshell is excellent for the climb itself when it is too cold for a base layer alone but you would boil in a full jacket.

For really cold days, add a synthetic insulated jacket or a lightweight down jacket. Synthetic insulation is the safer choice in the UK: it keeps insulating when wet, whereas down collapses and loses most of its warmth. Down is warmer for the weight on dry, bitter days in the Cairngorms, but it needs looking after.

• Climbing mid layer: grid fleece or thin softshell, worn open to vent.
• Stop layer: synthetic or down jacket, packed at the top of your rucksack, not buried.
• Backup: a spare fleece or gilet that stays dry in a stuff sack.

The shell: wind, rain and the summit pause

Wind strips heat from you far faster than cold air alone. A shell that blocks wind is doing more for your comfort than any amount of extra fleece. On a wet, windy summit, a properly waterproof and breathable jacket over a dry mid layer is the difference between a good day and a hypothermia scare.

Look for taped seams, a hood that actually stays up in a gale and can be cinched around a hat, and long enough cuffs to cover the tops of your gloves. Pit zips are worth their weight — they let you dump heat on the ascent without exposing your core. Waterproof trousers belong in the pack on every British hill day, even when the forecast is dry. Cold rain on bare legs drains warmth fast.

Take care of the shell. Wash it occasionally with a technical cleaner and reproof it — a dirty, wetted-out jacket stops breathing and starts feeling clammy from the inside.

Don't forget head, hands and feet

You lose a lot of heat through an uncovered head and neck. A hat and a buff or neck gaiter weigh almost nothing and transform how warm you feel on a windswept top. Two pairs of gloves is a sensible rule: a thin pair for walking and a warm, waterproof pair for stops. Wet gloves are worse than no gloves.

Feet need one pair of thin or midweight wool-blend socks, boots that fit properly, and nothing cotton in sight. Spare socks in the pack weigh little and feel wonderful at the end of a boggy descent.

A worked example for a cold, wet day

Picture a November ascent of a Lake District fell: five degrees in the valley, one degree with windchill on the top, rain forecast from midday.

• Next to skin: midweight synthetic or merino base layer, long sleeves.
• On the move: grid fleece over the base, shell on top with the hood up and pit zips open.
• In the pack: synthetic insulated jacket, waterproof trousers, spare gloves, hat, spare base layer in a dry bag.
• On the summit: insulated jacket straight on over everything, hat and dry gloves on, shell zipped to the chin before you stop moving.

The trick is to adjust before you get uncomfortable — vent early, add layers before you chill, and keep the warm kit where you can reach it without taking your rucksack off. Do that and cold, wet fell days become something to look forward to rather than endure.