The skin barrier under cold, wet and wind
A field publication about what actually happens to skin in a British winter of cold water, moving air and hours inside neoprene. Physiology first, mechanism by mechanism. No brands, no products, no affiliate links and nothing to sell you.
Every article names a physical load and states what it does to the structure and to water loss.
And the control that addresses that specific mechanism, plus what that control does not fix.
A cross section drawn for each piece, showing where in the skin the process actually happens.
A published line past which we stop describing and point to a pharmacist, a GP or 999.
Cold, water, friction and the structure that has to survive all three
Thirty five articles, each one built around a physical stressor and the control that acts on its mechanism rather than on the symptom.
The barrier
The structure that keeps water in, and what happens when it stops
6 articles02Cold, wind and dry air
Cold air holds almost no water, and heated air holds even less of what it could
6 articles03Water and immersion
Swelling, leaching and the film left behind when the water evaporates
6 articles04Friction and mechanics
Chafe is a materials problem, and it has a materials answer
6 articles05Materials and routine
Ingredient classes by function, and a routine that survives a car park
7 articles06Limits and referral
Where description stops and assessment begins
4 articlesRecent
What the skin barrier actually is
The outer layer of skin is a physical structure with a job: keep water in and keep the outside out. What it is made of, how it is assembled and why that assembly explains almost everything.
The barrierTransepidermal water loss, and why it explains almost everything
Water leaves your body through your skin continuously. The rate at which it does so is the single variable that ties cold air, wind, immersion and washing into one story.
The barrierWhat barrier damage actually means, physically
Damaged barrier is a phrase used to mean almost anything. There are three distinct physical failures behind it, they behave differently, and they need different responses.
The barrierThe barrier repair cycle, and how long it actually takes
Skin rebuilds its outer layer continuously. Understanding what that process needs, and how slow it is, changes what you expect from a week of better habits.
The barrierSleep, recovery and the barrier's repair window
The overnight hours are the longest uninterrupted stretch your skin gets, and also a period of relatively high water loss. What that means in practice, without the wellness claims.
The barrierSurface pH, and what washing actually changes
Intact skin is mildly acidic, and that acidity is functional. What raises it, how long it stays raised, and why frequency matters more than any single wash.
The barrierCold air is dry air: the physics behind winter skin
Cold air holds very little water even when it is saturated. That single fact explains most of what happens to outdoor skin between November and March.
Cold, wind and dry airWhy winter indoors is often worse than winter outdoors
You spend far more hours in heated air than in cold air, and heated air in winter has a lower relative humidity than the outdoors it came from. The maths favours the beach.
Cold, wind and dry airSun protection is not our subject
Ultraviolet exposure is a real stressor and it is covered properly by publications that specialise in it. Here it appears only in passing, as one load among several. Our subject is the barrier itself: what cold dry air, wind, salt water, occlusion and friction do to a physical structure, and how it rebuilds.
This page contains no commercial links. There is no advertiser, no sponsor, no affiliate arrangement and no product placement anywhere in it. We name no brand and no product, here or anywhere else on this site, and we describe ingredient classes only by what they do. Published by Northbank Media. Our funding is set out in full on the about page.
Field notes, once a fortnight
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