--- title: "Warmth tier, 10,000mm, four-way stretch: the one number golf layers never print is the one about wind" url: "https://ifrothgolf.com/read/windproof-golf-mid-layer" type: "explainer" topic: "clothing" author: "Tom Whitaker" published: "2026-09-20T14:00" publisher: "ifrothgolf" --- # Warmth tier, 10,000mm, four-way stretch: the one number golf layers never print is the one about wind > On a dry, raw autumn round you are not cold because of the temperature. You are cold because air is moving through your clothes, and the spec that would tell you whether a garment stops it is the one thing no golf brand puts on a swing tag. ## In short - Golf brands publish warmth tiers and waterproof ratings and never air permeability, which is the property that decides whether a layer keeps you warm in wind. Insulation only works when the air inside it stays still, so a thicker fleece is the wrong fix — either buy a mid-layer with a tight or treated face, or wear the waterproof shell you already own as a windbreaker on dry, raw days. Blow through a fabric before you buy it: if your breath passes easily, so does the wind. Here is the answer before the argument. On a dry October round at nine degrees with a fifteen-mile-an-hour breeze, the reason you are cold is almost never the nine degrees. It is the breeze, moving air through the knit of whatever you have on and carrying the warmth out with it. And the purchase nearly everybody makes in response — a thicker mid-layer — is the one purchase that cannot fix it, because insulation is trapped still air, and wind is the thing that stops the air being still. That is not a subtle mechanism and it is not controversial. What is strange is that the golf industry has made it impossible to shop for. ## The spec has a name. Count how many golf brands print it The property in question is air permeability: how much air passes through a square of fabric in a given time. Outdoor and cycling brands quote it, usually in cubic feet per minute, because in those sports it is understood to be the number that separates a wind shell from a jumper. Now read the technical claims on golf layers. Warmth tiers. Membrane names. A hydrostatic head figure in millimetres, because waterproofing is the one performance claim golf has agreed to quantify. Stretch percentages, recycled content, and on the better pieces an honest fibre breakdown. Across every mid-layer and shell we carry, not one states an air-permeability figure. The nearest thing to it in the whole catalogue is a line on the [Ping SensorDry Pro](https://ifrothgolf.com/product/ping-sensordry-pro-jacket) describing the membrane as air permeable — and note which direction that is pointing. It is there to reassure you that the jacket breathes. That is the whole problem in one phrase. Air permeability is a dial, not a feature. Turn it up and the garment breathes and you do not cook on the walk up the hill. Turn it down and the garment blocks wind. Golf brands have collectively decided to advertise one end of the dial and never number the other, and the result is a shopping aisle where the warmest-sounding garment and the warmest garment are different things. ## The caveat paragraph is telling you the truth. The warmth tier is not lying either Look at what the good brands say when they are being careful. The [Galvin Green Dwight INSULA](https://ifrothgolf.com/product/galvin-green-dwight-insula) is one of the best mid-layers made: air-chamber fabric that holds heat at a fraction of the thickness of a fleece, cut so you can still turn. Its own description tells you that as pure insulation it is not windproof, so on a raw, blowy day you will still want a shell over it. That is not a disclaimer. It is a definition. A warmth tier is an honest measure of how well a fabric traps still air, which is what insulation means and what it is sold as. It is not a measure of how warm you will be on a golf course, because a golf course in autumn is a place where the air is rarely still and you are moving through it for four hours. ## Why the thicker fleece does not work, and what does It is tempting to think loft is loft: if wind strips warm air out of a thin layer, a thick one has more to lose and will last longer. There is a grain of truth in that and it is a bad trade. Doubling the thickness of an open knit roughly doubles the volume of still air the wind has to displace, while a thin, tightly woven face fabric stops most of the air arriving in the first place. One of those is a linear improvement bought with bulk you have to swing in. The other is a step change bought with a few grams. That is before the second cost. A bulky mid-layer eats shoulder turn, which is a separate argument we have made at length in [the case for spending on the mid-layer rather than the shell](https://ifrothgolf.com/read/your-midlayer-is-doing-the-jackets-job). The point here is narrower and more annoying: the bulk you are paying the swing tax for is not even buying you the thing you wanted. So there are two honest ways to buy wind resistance in golf clothing, and only one of them is a product. ## Option one: a mid-layer with a face fabric that fights back A handful of mid-layers are built with a tight or treated outer face rather than a bare knit, and they are the only rung on the golf ladder that does anything about moving air. The [Ping Edwin half-zip](https://ifrothgolf.com/product/ping-edwin-half-zip-midlayer) is the cheap version of the idea: a grid-back fleece carrying a thermal treatment and a light water-resistant finish on the face. The [Under Armour Storm SweaterFleece](https://ifrothgolf.com/product/under-armour-storm-sweater-fleece) is the same principle with a brushed knit behind a Storm water-repellent finish. Be clear-eyed about what that finish is. A durable water repellent is a surface coating, not a membrane, and its job is beading rain, not blocking wind. What it does incidentally is sit on a denser woven or grid face and slow the passage of air compared with a lofty open fleece. That is a partial answer, and both garments say as much themselves. It is still a better partial answer than a thicker layer with nothing on the outside of it. ## Option two: wear the waterproof when it is not raining This is the layer nearly everybody skips, and it is free. The rain jacket in your bag is, for most golfers, the only genuinely wind-blocking garment they own. It is filed mentally under weather, so it comes out when water falls out of the sky and stays in the bag on a dry, grey, howling Tuesday in November — which is precisely the round on which it would have been worth the most. A waterproof golf shell like the SensorDry Pro is windproof by construction, because the membrane that stops liquid water also stops bulk airflow. Put it over a thin insulating layer on a dry, windy day and you have built, out of kit you already own, the thing the golf market barely sells: an insulator with a wind-blocking skin. You will be warmer than the person next to you in a fleece twice the thickness, and you will be able to turn. There is a real cost and you should know it. Wearing a shell on dry days puts UV and abrasion hours on it and wears the DWR down faster, so it will need reproofing sooner than it otherwise would. A tin of reproofer is a rounding error against a jacket you are actually getting the use of. ## The bottom of the stack, where two different kinds of cold happen Wind is one mechanism of heat loss. Evaporation is the other, and no outer garment can do anything about it, which is why the layer against your skin matters even in this argument. A technical base like the [Galvin Green SKINTIGHT](https://ifrothgolf.com/product/galvin-green-base-layer) moves sweat off you so that a breeze is stripping heat from dry skin rather than from a wet film — and wet fabric pulls heat away far faster than dry. Two mechanisms, one garment each, and neither one is solved by the other. The shirt in between deserves one sentence of honesty too. A pique polo like the [FootJoy Stretch Pique](https://ifrothgolf.com/product/footjoy-stretch-pique-solid-polo) is a textured knit specifically engineered to let air through, which is the correct design in July and is a small chimney in October. Nobody needs to buy a winter polo. It is simply worth knowing that the garment you are treating as neutral is, structurally, on the wind's side. ## The shop test that replaces the number nobody prints Until a golf brand puts a figure on a swing tag, there is a physical test that takes four seconds and works every time. Hold a single thickness of the fabric against your mouth and blow through it. If your breath passes without resistance, so does the wind, and that garment is an insulator and nothing else. If you have to push, the face fabric is doing something. Do it with the mid-layer you already own before you buy another one; a surprising number of expensive layers fail it instantly. ## Who should ignore all of this If you play sheltered inland parkland where the weather is mild and wet rather than raw and blowy, this is not your problem and inverting your spending would be a mistake. Buy the insulation and the shell on their own merits and read [what waterproof actually means](https://ifrothgolf.com/read/what-waterproof-actually-means) instead. Same if you are a summer golfer who packs up in October: none of this is a purchase you need to make. For everyone playing exposed golf between now and March, the ranking is short. The layer that is usually wrong is the mid-layer, because it gets chosen on thickness and thickness is the wrong axis. The layer that gets skipped is a wind-blocking outer on a day with no rain in it, and you almost certainly already own one. The full range is in our [mid-layers guide](https://ifrothgolf.com/guides/best-golf-mid-layers), and the whole cold-weather picture sits in our [clothing](https://ifrothgolf.com/clothing) coverage. ## The takeaway Golf brands publish warmth tiers and waterproof ratings and never air permeability, which is the property that decides whether a layer keeps you warm in wind. Insulation only works when the air inside it stays still, so a thicker fleece is the wrong fix — either buy a mid-layer with a tight or treated face, or wear the waterproof shell you already own as a windbreaker on dry, raw days. Blow through a fabric before you buy it: if your breath passes easily, so does the wind. ## FAQ ### What is air permeability in clothing? It is a measure of how much air passes through a fabric in a given time, usually quoted in cubic feet per minute by outdoor and cycling brands. A low figure means the fabric blocks wind; a high figure means it breathes freely. Golf brands rarely publish it, which is why warmth tiers and waterproof ratings are the only performance numbers you can compare on a golf layer. ### Why am I cold on the course even though I am wearing a thick fleece? Because insulation works by trapping still air, and wind replaces that air faster than your body can warm it. An open-knit fleece has almost no resistance to moving air, so on a breezy day the loft you paid for is being flushed out continuously. A thin layer with a wind-blocking outer will usually keep you warmer than a thick one without. ### Is a water-repellent finish the same as windproof? No. A durable water repellent is a surface coating designed to make rain bead and run off, and it is not a wind membrane. It does tend to sit on a denser woven or grid face fabric, which slows airflow compared with a bare fleece, so it helps at the margins. Treat it as a partial improvement rather than wind protection. ### Can I wear my waterproof golf jacket when it is not raining? Yes, and on a dry, windy day it is often the most useful thing in the bag. A waterproof membrane also blocks bulk airflow, so a shell over a thin insulating layer gives you wind protection without the bulk of a heavy fleece. The only real cost is that extra wear shortens the life of the water-repellent finish, which can be restored with a reproofing wash. ## Products mentioned - [Galvin Green Dwight INSULA Pullover](https://ifrothgolf.com/product/galvin-green-dwight-insula) · $170 approx — The clearest case in the catalogue: superb insulation, and its own spec sheet says it stops no wind at all. **Where to buy:** [Check price at Gamola Golf](https://www.gamolagolf.com/galvin-green-dwight-insula-pullover-navy-white-p1362) - [Ping Edwin Half-Zip Mid-Layer](https://ifrothgolf.com/product/ping-edwin-half-zip-midlayer) · $45 approx — A grid-back fleece with a treated face — the cheap end of the only mid-layer category that fights moving air. **Where to buy:** [Check price at Pin High Golf](https://pinhighgolf.co.uk/products/ping-edwin-mens-half-zip-midlayer) - [Under Armour Storm SweaterFleece Half-Zip](https://ifrothgolf.com/product/under-armour-storm-sweater-fleece) · $60 approx — A coating rather than a membrane, which is a partial answer and is sold as more than that. **Where to buy:** [Check price at Amazon](https://www.amazon.com/dp/B0C581L3B1?tag=ifrothgolf-20&ascsubtag=md_under-armour-storm-sweater-fleece) (affiliate link) · also stocked by GolfOnline - [Ping SensorDry Pro Waterproof Jacket](https://ifrothgolf.com/product/ping-sensordry-pro-jacket) · $200 approx — The genuinely windproof garment most golfers already own and leave in the bag when it is not raining. **Where to buy:** [Check price at Snainton Golf](https://www.snaintongolf.co.uk/ping-sensordry-pro-waterproof-golf-jacket) - [Galvin Green SKINTIGHT Thermal Base Layer](https://ifrothgolf.com/product/galvin-green-base-layer) · $90 approx — Handles the second heat-loss mechanism — damp skin — which no outer layer can fix for you. **Where to buy:** [Check price at Snainton Golf](https://www.snaintongolf.co.uk/galvin-green-elmo-skintight-thermal-base-layer21535371921) · also stocked by Amazon (UK) - [FootJoy Stretch Pique Solid Polo](https://ifrothgolf.com/product/footjoy-stretch-pique-solid-polo) · $70 approx — A textured pique knit: engineered to let air through, which is exactly right in July and exactly wrong in October. **Where to buy:** [Check price at Clubhouse Golf](https://www.clubhousegolf.co.uk/acatalog/FootJoy-Stretch-Pique-Solid-Golf-Polo-Shirt-Navy.html) · also stocked by Amazon (UK) --- Source: [ifrothgolf](https://ifrothgolf.com) — independent golf-gear editorial. Canonical URL: https://ifrothgolf.com/read/windproof-golf-mid-layer Quote or cite freely with attribution and a link to the canonical URL. Affiliate disclosure: ifrothgolf may earn a commission on purchases made through the retailer links above, at no extra cost to the buyer. It never changes what we recommend. https://ifrothgolf.com/disclosure