The first time I slept on a wool mattress was a revelation. As is so often the case with bed-based Damascene moments, this one happened on holiday. The wool and pocket-sprung mattress in our Lake District hotel room was cosy but breathable even in the height of summer, and it proved far too comfy to leap out of for early morning walks.

Back home, I soothed the post-holiday blues by seeking out wool mattresses to review. First, I tested the Millbrook Wool Luxury 4000, which is excellent but didn’t quite live up to that hallowed Cumbrian memory. Then came this Woolroom Standen Wool mattress, which did – and even nearly toppled the Otty Original Hybrid as best overall in our best mattresses roundup, where I called it “a masterpiece”.

Woolroom’s mattress didn’t quite claim the top spot though, mainly because it costs more than many people earn in a month. But its impact on my sleep has been miraculous, and its organic, natural fillings make it one of the most sustainable and durable mattresses I’ve ever tested. Here I’ll reveal why it’s (nearly) the best mattress you can buy.

How I tested

I was sent a double-size Woolroom Standen Wool in October 2025, when the nights were drawing in but temperatures remained stubbornly balmy. Before I tried any sleeping, my family testing panel came over to rate the Woolroom out of 10 for firmness and comfort. My husband, Alan, then helped me run our usual lab-style experiments with thermometers, weights and wobbly cups of water to measure the mattress’s sinkage, motion isolation, heat retention and edge support.

Alan and I intended to sleep on the Woolroom for two months, but we needed all the comfort we could get in January, so we ended up hanging on to it for five months. We tested it alongside Panda’s 10.5-tog Cloud duvet (the best duvet I’ve tested) and, on my side of the bed, an electric blanket. We also used a mattress protector, cotton fitted sheet and cotton duvet cover, all atop a slatted Ikea bed base.

What you need to know, from price to firmness

Price: The Woolroom is among the more expensive mattresses I’ve reviewed. The double I tested normally costs £2,219, although it’s discounted to £1,998 at the time of writing, and the full price of the largest emperor size (200 x 200cm) is £4,089. The Tempur Pro Plus SmartCool has a higher RRP, but the Woolroom is nonetheless pricey: about three-and-a-half times the price of the Otty.

Size and tension: The Woolroom comes in a wider range of sizes than most mattresses. There are eight in total, including the usual single (£1,769 at full price) and king (£2,489), plus a few non-standard sizes such as small double (£2,219), which at 120 x 190cm is ideal for guest rooms and smaller living spaces. All come in a choice of three tensions – soft, regular and firm – and measure 29cm deep. Much of this depth is made up of calico-encased pocket springs (1,400 of them in the king size), which Woolroom says are designed to adapt to your weight and movement to support “natural spinal alignment”. As I learned from experts when researching the best mattresses for back pain, spinal alignment is the key to comfortable sleep and a healthy back.

Construction: This mattress looks like a traditional pocket-sprung model, complete with tufted ticking on both sides and hand side-stitching to reinforce the edges. Inside, though, is a thoroughly modern construction, including more layers than most of the hybrid mattresses I’ve tested. Hybrids such as the Otty and the Simba Hybrid Pro use multiple layers of foam on top of springs, while the Woolroom has layers of wool, silk, cashmere and cotton. With six layers on each side of the sprung section, that’s a whopping 12 in total, excluding casing and springs.

Firmness: I found Woolroom’s mattress to be comfortably medium-firm, an impression backed up by my family and borne out by my tests with weights. The centre of the sleeping surface sank 3cm under 7.5kg of hand weights, which suggests it’s much firmer than the Tempur (which sank 4.2cm), but softer than the Otty (2.5cm).

Weight and turning: According to Woolroom, the double-size Standen weighs 40kg, about the same as the Otty and much lighter than the Millbrook, a double of which is 65kg. I couldn’t check this at home (my bathroom scales really wouldn’t thank me), but I found this mattress too heavy to turn on my own. That’s quite a disadvantage if you live alone, especially since Woolroom recommends turning this mattress “regularly” for the first 12 weeks, then once every three months.

Woolroom Standen Wool mattress specifications

Type: pocket sprung with wool layers
Firmness: the one we tested was advertised as regular, panel rated as 7.5/10
Depth: 29cm
Cover: not removable
Turn or rotate: “regularly” for 12 weeks, then every three months
Trial period: 100 nights
Warranty: 15 years
Old mattress recycling: £50
Sustainability: Woolroom’s environmental certifications include Wool ID, Global Organic Textile Standard and Oeko-Tex Standard 100, and the company has worked with Bangor University’s BioComposites team to ensure its products produce no VOC emissions

Delivery

Woolroom delivers its mattresses for free to the room of your choice, and the two-person team will take away your old mattress for recycling for an additional £50. You may have to wait a while for delivery, though. The double-size regular-tension Standen I tested is kept in stock and has a delivery time of two to three weeks, but non-standard sizes and the brand’s made-to-order mattresses have a lead time of four to five weeks.

Despite these caveats, the company receives excellent feedback from customers and has a generous 4.6 (“excellent”) score on Trustpilot. My own mattress arrived in about a week, courtesy of two polite deliverymen who carried it upstairs. There was less plastic to dispose of than with bed-in-a-box mattresses because it was delivered full-size rather than being vacuum shrunk then tightly wrapped. It was ready to sleep on straight away, too, and had none of the chemical “off-gassing” smell you tend to get with foam mattresses.

Sustainability

The absence of vacuum wrapping is just one of the many environmental green flags that led me to name the Woolroom “best sustainable mattress” in our best mattresses roundup. It’s made in the UK and almost entirely from natural materials, so its manufacture and disposal involve fewer resource-heavy processes than foam mattresses or foam-containing hybrids.

The fibres in Woolroom mattresses and other bedding, including its mattress toppers and duvets, are 100% organic (as certified by the Global Organic Textile Standard). All the wool is traceable under the Wool ID scheme, which ensures compliance with sustainability and animal welfare requirements. Woolroom mattresses aren’t vegan, but the wool is sourced ethically and transparently enough to eliminate any qualms I might have as a vegetarian.

Woolroom’s other rigorously tested certifications include Woolmark, the Allergy UK Seal of Approval and Oeko-Tex Standard 100 (it’s the only wool bedding retailer to hold this).

What we love

Comfort and sleep: The Woolroom Standen has the most immediately comfortable surface I’ve slept on in all my years of testing mattresses. Firmness preference is subjective, and many people love the sink-in sensation of foam, which can be so soothing for joint pain. But for me, the Woolroom felt ideal and improved my sleep more than any other mattress, so I didn’t hesitate to give it the full five stars.

It’s hard to quantify exactly why it helped me sleep, but I suspect it’s mostly down to the breathability of the materials and the supportive but wonderfully cosy tension. When you lie down on this mattress, or hurl yourself at it, there’s a satisfying “whumph” from the packed wool (imagine a five-star haystack) tempered by a luxuriously pillowy surface.

Supportiveness: As a petite side sleeper, I need some “give” to cradle my hips, knees and shoulders so my spine can align – which is essential for good sleep and long-term spinal comfort. The Woolroom ensured just that. It felt solid and robust beneath me but yielded enough to feel incredibly comfortable and, crucially, accommodate the curves of my body.

Motion isolation: The mattress’s wool layers compressed over our five months of sleeping on it, so we had to turn it every couple of weeks to avoid long-term indentations where we slept. There was none of the softening you get with foam, though. I hadn’t expected such good motion isolation without foam, which normally does the job of tempering the bounce of springs. Wool is good at this too, it turns out, and capably absorbs the movements of a fidgety sleeping partner (something Alan and I both have to contend with).

Heat and breathability: The undulating tufted surface allows air to circulate around your body much more efficiently than flat foam surfaces tend to, and the airy sprung core with natural fibre layers made this the most breathable mattress I have slept on. Wool, cotton, cashmere and silk are nature’s temperature regulators, keeping you cosy but not trapping heat in the way foam and other synthetic fibres can. They’re also safe to use with an electric blanket on chilly nights, unlike memory foam, which softens when heated. Even after using an electric blanket to soothe myself to sleep in January and February, I never had night sweats when using this mattress.

To put my impressions of the Woolroom’s breathability to the test, I used a microwavable weighted blanket to heat up its surface to 30C and then asked my husband to sit on the hot patch while I used a thermocouple to measure how quickly it cooled down. In 10 minutes of being sat on, the patch cooled down significantly to 20C, just 4C above ambient temperature. Either this means the Woolroom does an exceptional job of dissipating heat, or my husband’s bottom is not as hot as I thought.

What we don’t love

Price was the main reason the Woolroom failed to achieve the top spot in my best mattresses roundup. I think it’s worth the money if you’re in the market for a premium sleeping surface, but with outstanding mattresses available at less than £600 for a double, £2,000-plus is a lot to pay in a cost of living crisis.

Like most mattresses with a tufted surface, including the Millbrook Wool Luxury 4000, the Woolroom doesn’t have a removable cover that you can unzip for washing in the machine. That means it’s important to use a mattress protector to help keep the mattress clean – and indeed, Woolroom only gives you a 100-night trial with this mattress if you buy one of its own mattress protectors along with it.

My other criticisms are fairly minor. The Woolroom was too heavy for me to turn on my own, which isn’t ideal because it needs regular turning, especially in its first few months. I also noticed it’s a little smaller in width and length than the other doubles I’ve tested, albeit by only a few millimetres.

Woolroom Standen Wool: should I buy it?

I warmly recommend the Woolroom Standen Wool if you want to upgrade to a premium mattress that’ll last many years without sagging. It will support your sleeping body without feeling too firm, and help you stay warm and cool as needed. It’s just a shame that, in order to qualify for the 100-night trial, you have to fork out for the brand’s own mattress protector when buying this already-expensive mattress.

For more ways to sleep better with the Filter:
The best mattresses, tested
The best mattress toppers
The best pillows, tested

Jane Hoskyn is a features journalist and WFH pioneer with three decades of experience in rearranging bookshelves and “testing” bedding while deadlines loom. When she’s not napping, she would rather be in the woods