https://www.surfskinlab.co.uk/ Barrier physiology for people who are outdoors in bad weather by choice. Water loss, cold air, salt, occlusion and friction, described by mechanism. en-GB Sun, 09 Aug 2026 15:31:53 +0000 Northbank Media 2026 Northbank Media editorial@surfskinlab.co.uk (Northbank Media) https://www.surfskinlab.co.uk/water/wet-and-dry-cycling https://www.surfskinlab.co.uk/water/wet-and-dry-cycling Sat, 01 Aug 2026 09:00:00 +0000 Skin that is constantly wet has one problem. Skin that is constantly dry has another. Skin that goes back and forth all day has a third, and it is worse than Surf Skin Lab https://www.surfskinlab.co.uk/water/showering-after-a-session https://www.surfskinlab.co.uk/water/showering-after-a-session Sat, 01 Aug 2026 09:00:00 +0000 The post session shower is the one immersion you control completely, and for most people it does more barrier damage than the session did. Surf Skin Lab https://www.surfskinlab.co.uk/water/salt-water-and-the-stratum-corneum https://www.surfskinlab.co.uk/water/salt-water-and-the-stratum-corneum Sat, 01 Aug 2026 09:00:00 +0000 Sea water swells the outer cells, rinses out what holds water inside them, and then leaves a salt film that keeps drawing after you are out. Three effects, o Surf Skin Lab https://www.surfskinlab.co.uk/water/neoprene-and-occlusion https://www.surfskinlab.co.uk/water/neoprene-and-occlusion Sat, 01 Aug 2026 09:00:00 +0000 A wetsuit creates a small, warm, wet, enclosed environment against the skin for hours at a time. What that does to the outer layer, and what the seams do on Surf Skin Lab https://www.surfskinlab.co.uk/water/hard-water-surfactants-and-residue https://www.surfskinlab.co.uk/water/hard-water-surfactants-and-residue Sat, 01 Aug 2026 09:00:00 +0000 Water hardness varies enormously across Britain, and it changes how much wash you use, what is left on the skin and how much washing it takes to remove it. Surf Skin Lab https://www.surfskinlab.co.uk/water/fresh-salt-and-treated-water-compared https://www.surfskinlab.co.uk/water/fresh-salt-and-treated-water-compared Sat, 01 Aug 2026 09:00:00 +0000 Different waters do different things to the outer layer. A short comparison, with the pool chemistry left to the publication that owns it. Surf Skin Lab https://www.surfskinlab.co.uk/water https://www.surfskinlab.co.uk/water Sat, 01 Aug 2026 09:00:00 +0000 What repeated salt immersion does to the outer layer, why fresh water is the harsher soak, why the wet and dry cycle costs more than either state, and what h Surf Skin Lab https://www.surfskinlab.co.uk/materials/the-car-park-routine https://www.surfskinlab.co.uk/materials/the-car-park-routine Sat, 01 Aug 2026 09:00:00 +0000 Every sensible post session recommendation assumes a warm bathroom and ten spare minutes. Here is the version for a February car park with numb hands. Surf Skin Lab https://www.surfskinlab.co.uk/materials/reading-an-ingredient-list-by-function https://www.surfskinlab.co.uk/materials/reading-an-ingredient-list-by-function Sat, 01 Aug 2026 09:00:00 +0000 A practical method for working out what a product will do from its list, without knowing any chemistry and without trusting anything on the front. Surf Skin Lab https://www.surfskinlab.co.uk/materials/patch-testing-as-a-self-care-practice https://www.surfskinlab.co.uk/materials/patch-testing-as-a-self-care-practice Sat, 01 Aug 2026 09:00:00 +0000 Trying something new on a small area first is sensible and cheap. It is also not the same thing as clinical patch testing, and confusing the two causes probl Surf Skin Lab https://www.surfskinlab.co.uk/materials/occlusives-humectants-and-emollients https://www.surfskinlab.co.uk/materials/occlusives-humectants-and-emollients Sat, 01 Aug 2026 09:00:00 +0000 Three classes of ingredient with three distinct mechanisms, routinely described as though they were one thing called moisturiser. Separating them changes wha Surf Skin Lab https://www.surfskinlab.co.uk/materials/ingredient-classes-that-support-repair https://www.surfskinlab.co.uk/materials/ingredient-classes-that-support-repair Sat, 01 Aug 2026 09:00:00 +0000 A functional vocabulary for reading a label, with no brands, no products and no claims we cannot support. Surf Skin Lab https://www.surfskinlab.co.uk/materials/fragrance-free-and-hypoallergenic https://www.surfskinlab.co.uk/materials/fragrance-free-and-hypoallergenic Sat, 01 Aug 2026 09:00:00 +0000 Two of the most reassuring words on a label, and two of the least informative. What each one is required to mean, and what it is not. Surf Skin Lab https://www.surfskinlab.co.uk/materials/field-care-for-lips-and-hands https://www.surfskinlab.co.uk/materials/field-care-for-lips-and-hands Sat, 01 Aug 2026 09:00:00 +0000 Two sites account for most winter skin complaints in outdoor people, and both are manageable with almost nothing, provided the almost nothing is actually wit Surf Skin Lab https://www.surfskinlab.co.uk/materials https://www.surfskinlab.co.uk/materials Sat, 01 Aug 2026 09:00:00 +0000 Occlusives, humectants and emollients as three different jobs. What labels do and do not mean. And the five minutes after a session, ordered by benefit per s Surf Skin Lab https://www.surfskinlab.co.uk/limits/when-to-see-a-pharmacist-or-gp https://www.surfskinlab.co.uk/limits/when-to-see-a-pharmacist-or-gp Sat, 01 Aug 2026 09:00:00 +0000 A publication about skin physiology has a hard boundary. This article marks it, states what is on the other side, and explains how to get across it efficient Surf Skin Lab https://www.surfskinlab.co.uk/limits/what-this-publication-will-not-do https://www.surfskinlab.co.uk/limits/what-this-publication-will-not-do Sat, 01 Aug 2026 09:00:00 +0000 The refusals are the editorial position. Set out in full, so that anyone can check whether we keep to them. Surf Skin Lab https://www.surfskinlab.co.uk/limits/reading-skin-claims-critically https://www.surfskinlab.co.uk/limits/reading-skin-claims-critically Sat, 01 Aug 2026 09:00:00 +0000 A method for assessing what you are told about skin, applied to marketing, to social media, to research summaries and to this publication. Surf Skin Lab https://www.surfskinlab.co.uk/limits/occupational-skin-and-outdoor-work https://www.surfskinlab.co.uk/limits/occupational-skin-and-outdoor-work Sat, 01 Aug 2026 09:00:00 +0000 If your hands are cracking because of your job, that is a workplace health matter with duties attached, not a personal misfortune to be managed with hand cre Surf Skin Lab https://www.surfskinlab.co.uk/limits https://www.surfskinlab.co.uk/limits Sat, 01 Aug 2026 09:00:00 +0000 The boundary of this publication, stated once and kept to. When to see a pharmacist or a GP, what an occupational skin problem changes, how to read a claim, Surf Skin Lab https://www.surfskinlab.co.uk/friction/shaving-on-stressed-skin https://www.surfskinlab.co.uk/friction/shaving-on-stressed-skin Sat, 01 Aug 2026 09:00:00 +0000 A blade removes surface cells along with hair. On a barrier that is already thinned by cold, wind and salt, that is a significant additional load applied del Surf Skin Lab https://www.surfskinlab.co.uk/friction/seams-collars-and-pressure-points https://www.surfskinlab.co.uk/friction/seams-collars-and-pressure-points Sat, 01 Aug 2026 09:00:00 +0000 Most recurring skin trouble in outdoor sport comes from one specific contact. Locating it is a diagnostic exercise you can actually do, unlike most of them. Surf Skin Lab https://www.surfskinlab.co.uk/friction/scalp-and-hair-under-salt-and-wind https://www.surfskinlab.co.uk/friction/scalp-and-hair-under-salt-and-wind Sat, 01 Aug 2026 09:00:00 +0000 The scalp is the site most reliably left unrinsed and most often covered by the least ventilated piece of kit you own. Hair and scalp are separate problems w Surf Skin Lab https://www.surfskinlab.co.uk/friction/friction-rash-and-chafe https://www.surfskinlab.co.uk/friction/friction-rash-and-chafe Sat, 01 Aug 2026 09:00:00 +0000 Chafe is not an allergy and it is not a hygiene failure. It is material moving against skin, and it has the controls that any friction problem has. Surf Skin Lab https://www.surfskinlab.co.uk/friction/cracked-hands-and-fissures https://www.surfskinlab.co.uk/friction/cracked-hands-and-fissures Sat, 01 Aug 2026 09:00:00 +0000 A fissure is a crack through a stiff layer under tensile load. Understanding it as a materials problem explains why it hurts so much and why it takes so long Surf Skin Lab https://www.surfskinlab.co.uk/friction/chapped-lips-and-why-lips-are-different https://www.surfskinlab.co.uk/friction/chapped-lips-and-why-lips-are-different Sat, 01 Aug 2026 09:00:00 +0000 Lips lose water faster than any other exposed surface, have almost no defences of their own, and are constantly wetted and dried. The mechanism, and the one Surf Skin Lab https://www.surfskinlab.co.uk/friction https://www.surfskinlab.co.uk/friction Sat, 01 Aug 2026 09:00:00 +0000 Load, friction coefficient, sliding distance and the state of the layer. Seams, collars, fissures, lips, scalp and the blade you draw across a face that has Surf Skin Lab https://www.surfskinlab.co.uk/cold/windburn-and-what-it-actually-is https://www.surfskinlab.co.uk/cold/windburn-and-what-it-actually-is Sat, 01 Aug 2026 09:00:00 +0000 A red, hot, tight face after a long exposure gets called windburn. At least three different processes produce that appearance, and they need different respon Surf Skin Lab https://www.surfskinlab.co.uk/cold/wind-as-a-mechanical-stressor https://www.surfskinlab.co.uk/cold/wind-as-a-mechanical-stressor Sat, 01 Aug 2026 09:00:00 +0000 Wind does two separate things to skin, and only one of them is about drying. The other is abrasion, and it is why the same wind on a sandy beach is worse tha Surf Skin Lab https://www.surfskinlab.co.uk/cold/why-winter-indoors-is-worse https://www.surfskinlab.co.uk/cold/why-winter-indoors-is-worse Sat, 01 Aug 2026 09:00:00 +0000 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 fav Surf Skin Lab https://www.surfskinlab.co.uk/cold/hand-skin-in-cold-water https://www.surfskinlab.co.uk/cold/hand-skin-in-cold-water Sat, 01 Aug 2026 09:00:00 +0000 Hands take the worst of a cold water session and are also the site that recovers most slowly. The reasons are structural, circulatory and mechanical at once. Surf Skin Lab https://www.surfskinlab.co.uk/cold/cold-related-skin-responses https://www.surfskinlab.co.uk/cold/cold-related-skin-responses Sat, 01 Aug 2026 09:00:00 +0000 Skin does several recognised things in response to cold, from ordinary flushing to reactions that need proper assessment. Where the line is, and why we do no Surf Skin Lab https://www.surfskinlab.co.uk/cold/cold-air-and-absolute-humidity https://www.surfskinlab.co.uk/cold/cold-air-and-absolute-humidity Sat, 01 Aug 2026 09:00:00 +0000 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. Surf Skin Lab https://www.surfskinlab.co.uk/cold https://www.surfskinlab.co.uk/cold Sat, 01 Aug 2026 09:00:00 +0000 Absolute against relative humidity, why a heated room in January is harder on skin than the beach it came from, what wind does mechanically as well as evapor Surf Skin Lab https://www.surfskinlab.co.uk/barrier/what-the-skin-barrier-actually-is https://www.surfskinlab.co.uk/barrier/what-the-skin-barrier-actually-is Sat, 01 Aug 2026 09:00:00 +0000 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 asse Surf Skin Lab https://www.surfskinlab.co.uk/barrier/what-barrier-damage-actually-means https://www.surfskinlab.co.uk/barrier/what-barrier-damage-actually-means Sat, 01 Aug 2026 09:00:00 +0000 Damaged barrier is a phrase used to mean almost anything. There are three distinct physical failures behind it, they behave differently, and they need differ Surf Skin Lab https://www.surfskinlab.co.uk/barrier/transepidermal-water-loss-explained https://www.surfskinlab.co.uk/barrier/transepidermal-water-loss-explained Sat, 01 Aug 2026 09:00:00 +0000 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 in Surf Skin Lab https://www.surfskinlab.co.uk/barrier/the-barrier-repair-cycle https://www.surfskinlab.co.uk/barrier/the-barrier-repair-cycle Sat, 01 Aug 2026 09:00:00 +0000 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. Surf Skin Lab https://www.surfskinlab.co.uk/barrier/surface-ph-and-what-washing-changes https://www.surfskinlab.co.uk/barrier/surface-ph-and-what-washing-changes Sat, 01 Aug 2026 09:00:00 +0000 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. Surf Skin Lab https://www.surfskinlab.co.uk/barrier/sleep-recovery-and-skin-repair https://www.surfskinlab.co.uk/barrier/sleep-recovery-and-skin-repair Sat, 01 Aug 2026 09:00:00 +0000 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, witho Surf Skin Lab https://www.surfskinlab.co.uk/barrier https://www.surfskinlab.co.uk/barrier Sat, 01 Aug 2026 09:00:00 +0000 What the stratum corneum is made of, why transepidermal water loss explains most of what outdoor people feel, the three ways a barrier fails, and how long it Surf Skin Lab