Forest school is the hardest test a piece of children's rainwear faces in a normal school week, and it is not close. Two hours or more outdoors, in weather that would keep most families indoors, with a child who spends a large part of that time sitting, kneeling and lying on wet ground. Nothing else in a primary week combines duration, ground contact and going ahead regardless.
Which means that if you buy for forest school, everything else is covered. Buy for the school run instead and forest school will find every weakness in a fortnight. This guide sets out what the session actually demands, why coverage matters more than the number on the label, and what tends to go wrong.
It is written to apply to any kit from any brand. Where the answer is genuinely a judgement call rather than a fact, we have said so.
What's on this page
If you read two sections, read the one on coverage and the one on feet. Those are where most of the disappointment in this category comes from.
Why forest school is different
Four things separate a forest school session from every other outdoor slot in a school week, and each one puts a specific demand on the kit.
It runs regardless. The Forest School Association describes forest school as a long-term process of regular sessions in a woodland or natural setting, and regularity is the point. Sessions are not cancelled because it is raining. That is the whole pedagogy, and it means the kit is used in conditions a family would normally avoid.
It lasts. An hour and a half to three hours is typical. Small gaps in coverage that are irrelevant on a ten-minute walk become significant over that period, because water arriving slowly still arrives.
It happens on the ground. Children sit on logs, kneel in leaf litter, lie down to look at things, crawl through gaps. Ground contact is not incidental to forest school, it is most of it. This single fact drives nearly every recommendation below.
The activity is child-led and irregular. A child might be running for ten minutes, then sitting still for twenty. That alternation between generating heat and generating none is much harder to dress for than steady activity, and it is why children so often come home simultaneously sweaty and cold.
There is a fifth consideration that is not about weather at all. Forest school involves supported risk taking with real tools and fire, and settings will have their own requirements about clothing. Anything loose, dangling or synthetic-and-near-flames is worth checking with the leader rather than assuming.
The four ways children come home wet or cold
Parents usually report this as "the waterproofs leaked". Usually they did not. There are four distinct mechanisms and only one of them is a leak.
Water arrives from below. A child sitting on soaked ground has their body weight pressing fabric into standing water. Pressure drives water through a waterproof barrier far more effectively than falling rain does, which is precisely what a hydrostatic head figure measures. This is why a garment that copes perfectly with a downpour can still wet through at the seat and knees within half an hour of a session.
Water arrives at the waist. On a two-piece, crouching lifts the trouser waistband and drops the jacket hem, and the water running down the jacket lands on the waistband instead of the outside of the trousers. Waistbands are usually the least waterproof part of any garment and they wick inward. Nothing leaked; the water went between.
Water arrives from inside. A child who ran about in a fleece and a waterproof for twenty minutes is damp before the rain does anything. Coated rainwear is not breathable, so that moisture stays. Then they sit still and it cools them. This is the commonest cause of a child being cold and it is entirely a layering problem.
Water arrives up the sleeves and legs. Cuffs are the most common leak point on any children's garment, because water runs down a sleeve and travels up the forearm the moment a child raises their hand, which they do constantly. Trouser hems that sit above a welly top let wind push rain up the leg.
Notice that three of the four are design and layering problems rather than fabric problems. Buying a higher hydrostatic head figure fixes only the first, and only partly.
Coverage beats waterproof rating
Given the above, the ranking of what matters for forest school specifically is not the ranking you would use for a school coat.
First, no gap at the waist. A one-piece removes the join entirely. A bib-and-brace covers chest and back so a jacket over the top leaves nothing exposed. Separate over-trousers plus a jacket is the weakest configuration here, not because either garment is worse but because the join is where the water gets in when a child crouches.
Second, seat and knee coverage that survives pressure. This is where a genuinely higher rating earns its money, because the failure mode is pressure rather than rainfall. Seams matter as much as fabric: an untaped inside-leg or seat seam will let water through while the fabric beside it holds.
Third, closable cuffs and hems. Elasticated, popper-adjustable or stirruped. A plain open hem or cuff undoes a great deal of otherwise good kit.
Fourth, a hood that stays up. A hood a child has to hold is a hood that is not being used, because their hands are busy. Structure and adjustment matter more than fabric here.
Fifth, the number on the label. It matters, and it matters less than the four things above. A well-designed garment at a modest rating will out-perform a badly designed one at a high rating in these conditions.
For the detail on what those ratings mean and how seams are constructed, our complete waterproof over trousers buyer's guide covers the technical ground. For the one-piece versus two-piece decision, our guide to choosing between a rainsuit and a matched set works through the independence question, which is the other half of it.
Layering for a session, not a walk
The alternation between running about and sitting still is the hardest thing to dress for, and it is where most cold children come from.
The principle is three layers, each doing one job. A base layer next to the skin that moves moisture away and keeps working when damp. A mid layer that traps air, which is what insulation actually is. A shell that blocks rain and wind and provides no warmth of its own.
Avoid cotton against the skin. This is the single most useful thing in this section. Cotton holds moisture and keeps drawing heat while it dries, so a cotton school t-shirt sweated into during the running-about phase will still be cooling the child an hour later. Synthetic or wool base layers keep insulating when damp.
Send them slightly cool. A child dressed to be comfortable standing still at the start will overheat within ten minutes and be damp for the rest of the session. Slightly underdressed at the start is the right target, which feels wrong to every parent and works.
Send a spare mid layer rather than a thicker one. A thin fleece in the bag that can be added when they settle down is more useful than a thick one worn throughout, because it can respond to what actually happens.
Fleece-lined waterproofs are a real option for younger children. Managing three separate layers in a nursery cloakroom is genuinely harder than managing one lined garment, and for under-fives the simpler system often wins even though the layered one is better in principle.
If your child comes home dry but cold, that is not a waterproofing failure and a more waterproof garment will not fix it. It is a layering gap.
Feet, which decide the whole session
Feet are the most common cause of a child asking to go inside, and they get the least attention when parents are buying kit.
The reason is compounding. Feet are in constant contact with cold, wet ground, they are under body weight, and they get much less movement than the rest of the child. Wet socks in cold conditions will end a session faster than a wet back.
Wellies or waterproof boots, not trainers. Water-resistant trainers are wet through within twenty minutes on soaked grass. This is not a close call.
Wellies keep water out and offer almost no insulation. That is the trade. In autumn they are fine; in January they need a thick sock or a welly liner, or a child will be cold in perfectly dry boots. Insulated or lined wellies exist and are worth considering for winter sessions.
Wool socks over cotton. Same principle as the base layer. Cotton socks hold sweat and cool the foot from the inside even when the boot is dry.
Room matters. A tight boot restricts circulation and makes a cold foot colder, and a thick winter sock in a boot sized for a thin summer one creates exactly that problem. Size wellies with the winter sock on.
Rainwear goes over the boot, never tucked in. Tucked in, every drop running down the leg is delivered straight into the boot. This is such a common mistake that it is worth showing a child once rather than telling them.
Spare socks in the bag are the highest-value thing you can send, and they weigh nothing.
Hands, and why gloves usually fail
Hands are the other extremity that ends sessions, and gloves are genuinely difficult here in a way they are not for a walk to school.
The problem is that forest school requires hands. Children are picking things up, using tools, tying knots, building. Gloves that are warm enough tend to be too bulky for that, so they come off, and once off they are usually lost or left somewhere wet.
What tends to work better: gloves that survive being wet rather than gloves that are warm when dry, since they will get wet. Two cheap pairs rather than one good pair, so there is a dry set for the second half. Mittens for younger children, who lose less heat from mittens but can do less in them. And a strap or clip so they stay attached to the coat.
Be realistic about it. Many settings find children manage better with cold hands and warm everything else than with gloves that stop them doing the activity. Warm dry hands at the end matter more than warm hands throughout, so a dry pair for the walk back is often the better investment.
Managing kit at the setting
Kit that works at home fails at school for reasons that have nothing to do with the garment.
Label everything, including detachable parts. A detachable hood in a lost property box is not identifiable. This is also an argument for a fixed or roll-away hood on a child's forest school jacket rather than a detachable one.
Send it in one bag, and the same bag every week. Kit that arrives in a carrier bag one week and a rucksack the next gets separated. A dedicated forest school bag that lives packed is the arrangement that survives a term.
Assume nothing dries at school. Most settings have nowhere to dry a wet suit properly between sessions, so it comes home wet and goes back next week in whatever condition you left it. Which makes the home drying routine the thing that determines whether the kit is usable in week six.
Hang it, do not fold it, and never leave it in the bag. A wet garment balled up from Wednesday to the following Tuesday grows mildew on the inside of the coating, and that does not wash out. This is the single most common way forest school kit dies, and it is entirely avoidable.
Wipe clean rather than machine wash. Detergent and heat degrade coatings and lift seam tape. Rinse the worst off while it is still wet, sponge with mild soapy water, hang to dry away from a radiator. Check the label, since some membrane fabrics do want an occasional technical wash.
Ask what the setting expects. Some provide spare suits, some ask for wellies to stay on site, some have views about what children wear near a fire. Five minutes of asking prevents a wasted purchase.
Buying to the session, not the average day
The strategic point that ties this together: forest school sets the requirement for the whole wardrobe.
If you buy kit that handles a two-hour session on wet ground, it will handle the school run, the dog walk and the touchline without thinking about it. If you buy for the school run and use it at forest school, you will replace it, and probably mid-term.
That does not mean buying the most expensive thing available. It means prioritising differently: full body cover over a jacket, a properly closable hem over a fashionable one, proper wellies over water-resistant trainers, and a wool base layer over a cotton one. Most of those choices cost little or nothing extra.
It also means accepting that forest school kit gets destroyed faster than anything else a child owns. Brambles, tree sap, mud, fire pits, being sat on constantly. Expect a shorter life than you would from a school coat, and buy accordingly rather than buying something precious.
One genuinely cheap intervention worth more than most upgrades: something waterproof to sit on. A folded compost sack or a cheap foam pad removes the single biggest failure mode described in this article, and costs almost nothing.
Frequently asked questions
What waterproofs does my child need for forest school?
Full body cover is the priority: a one-piece rainsuit, or a bib-and-brace with a jacket over the top. Separate over-trousers and a jacket work less well because the waist join is exposed every time a child crouches, which at forest school is constantly. Add proper wellies and a non-cotton base layer.
Is a puddle suit or a two-piece better for forest school?
For coverage, a one-piece, because there is no join. For independence, a two-piece, because the child can manage a toilet trip alone. Many families keep a one-piece specifically for forest school long after moving to a two-piece for everything else, which is a sensible compromise rather than an indulgence.
Why does my child come home cold but dry?
That is a layering problem, not a waterproofing one. A shell provides no insulation. It is usually either not enough underneath, or cotton next to the skin holding moisture from the active part of the session and cooling them once they sit still. Add a thin fleece and switch the base layer to wool or synthetic.
Do wellies keep feet warm?
They keep water out and insulate very little. In cold weather a child can have thoroughly cold feet in perfectly dry wellies. Use a thick wool sock or a welly liner, size the boot with that sock on so it is not tight, and consider lined wellies for winter sessions.
Should waterproof trousers go inside or outside wellies?
Outside, always. Tucked inside, water running down the leg is funnelled straight into the boot. The hem should sit over the top of the boot so water runs down the outside. Worth demonstrating once rather than explaining.
How do I stop the kit smelling by half term?
Do not leave it in the bag. A wet garment stored for a week grows mildew on the inside of the coating and it does not wash out. Unpack it the day it comes home, rinse the mud off while it is still wet, and hang it somewhere airy away from direct heat.
Can I just use a school coat?
For the top half in light rain, sometimes. For a full session, rarely: school coats are usually shower-resistant rather than waterproof, they are not cut for sitting on wet ground, and they are the garment your child needs on the other four days of the week. Dedicated kit keeps the school coat dry as well.
More from our resource library
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The complete list for a session: forest school and school kit list.
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Clothing and layering beyond the waterproofs: what to wear to forest school.
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For younger children in a nursery setting: nursery and preschool waterproofs.
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The daily walk rather than the session: waterproofs for the school run.
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The wider category: the complete kids rainwear buyer's guide.
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One-piece or two-piece: jacket and trouser sets compared.
Kitting out for the term? Browse our children's all-in-one rainsuits, over-trousers, pack-away jackets and matched sets. Size charts, full specifications and care instructions are on each product page.
The Wet Weather Kids Editorial Team
We are a UK retailer specialising in unisex rainwear for families: pack-away jackets, waterproof over-trousers and all-in-one rainsuits for school runs, forest school and standing on wet touchlines. This guide is general buying advice. For the specification of any particular garment, see its product page.
