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How do you define “cool”? Maybe it’s ostentation. Maybe it’s exclusivity. Maybe it’s a 250-year-old orthopaedically inspired German shoe. In 2023, odds are it’s the latter. This week, it was announced that Birkenstock had landed on the US stock market with a $7.5bn (£6.1bn) valuation, more than double its worth in 2021. If you’re unfamiliar with these absurdly comfortable sandals, the classic “Arizona” Birkenstock features a layered sole made of jute fibre and moulded cork, offering your foot some serious support, with two thick suede straps coming in some sort of earthy hue. The brand itself dates back to 1774, when founder Johann Adam Birkenstock started making shoes near Frankfurt. But for a long time, the shoes themselves were the pinnacle of dorkiness. There was nothing chic about the geek connotations, either. They were just, to put it bluntly, a bit lame – often associated with exceedingly earnest, granola-eating American liberals, and dubbed everything from “Geekenstocks” to “Flintstone feet”. You get the idea. Today, though, Birkenstock sells roughly 25 million pairs of shoes a year, and the brand is seen on and celebrated by stars such as Kendall Jenner, Gigi Hadid, Katie Holmes and Sienna Miller. Some have even been spotted wearing them with socks, demolishing decades of jokes about a look once considered fashion’s cardinal sin. It all adds up to form the greatest redemption arc in footwear. But how has one company managed to pull off a complete 180, as if transforming a pumpkin into Cinderella’s glass slipper? “The German engineering that has gone into this product actually speaks for itself,” says fashion analyst and author of Look at the Labels, Jennifer Walderdorff. “There are no gimmicks: the shoe does what it says on the tin. Its reliability is what [makes it] a fashion staple.” It has not been a quick turnaround, though, its reappraisal starting – sort of – in the 1990s. Fashion fans may recall the famous photos of Kate Moss taken in 1990 by Corinne Day. They show Moss, then 15, posing topless on a beach in Camber Sands, smoking a cigarette in a series of shots that would later make her one of the most influential models and faces of her generation. But there is a small fact about the photos that often gets forgotten: Moss is wearing Birkenstocks in them. It took a little longer for the trend to catch on properly. In 2013, Oliver Reichert became the first person outside the Birkenstock family to run the company, and it’s his leadership that’s helped steer the brand’s perception. It was that same year, for example, that Birkenstock began making appearances on runways: Céline models wore blue fur-lined sandals inspired by the German shoe, while A-list stars including Naomi Watts and Ashley Olsen started wearing them out and about. That summer, American Vogue declared that its staffers had, against all odds, “fallen for the Birkenstock”, noting how “a bulky shoe is actually more flattering on the leg than you would think”. In the world we live in today, there is so much more room for fashion and function, hence the appeal of the Birk Jennifer Walderdorff, fashion analyst It’s from here that the humble Birkenstock began its ascent into the heart of the fashion zeitgeist. By 2017, there were designer collaborations, with Barneys New York partnering with the brand to release a limited edition line of pink fur-lined sandals. Collaborations followed with other brands including Opening Ceremony, Rick Owens, and, most recently, Valentino. But as the latest valuation shows, the brand found a new lease of life this summer. You could barely step outside your house without spotting a pair. As for what’s fueled this recent surge, we can look to the pandemic, when we forwent shoes entirely and got accustomed to putting our comfort above all else. When lockdowns were lifted, all of us re-emerged with a shifted set of sartorial priorities, with high heels falling further down the totem pole in terms of stature and status. Today, there is nothing trendier than having your feet close to the ground. What is particularly interesting about Birkenstock as a brand is that despite the constant movement of fashion trend cycles, the design of its signature shoe hasn’t changed. “Birkenstock has lasted so long and grown to be the super giant it is because of the awareness and availability of information on its benefits,” adds Walderdorff. “There are lots of clothing items that are no longer worn due to their detrimental effects on the body, like corsets, which realign your internal organs to no gain. Similarly, overwearing high heels contributes to foot deformities. In the world we live in today, there is so much more room for fashion and function, hence the appeal of the Birk.” The rise of “normcore” can also be attributed to Birkenstock’s popularity. Characterised by unpretentious, utilitarian and functional clothing, the trend lends itself to the aesthetic of an orthopaedic shoe. “Normcore” also provide Birkenstocks the air of new wave edge, the shoes slotting neatly into a look that has become particularly popular among east London hipsters – take one look at the Instagram meme account Real Housewives of Clapton (which parodies a very specific type of natural-wine-drinking, Perello olive-eating, east Londoner) and you’ll see what I mean. Fashion has also generally seen an exponential rise in flat shoes. According to the Lyst Index, the industry’s quarterly report ranking fashion’s hottest brands and products according to Google searches and social media mentions, the season’s must-have is the Maison Margiela Tabi, a split-toed Japanese-inspired loafer. In fourth place is the Nike x Martine Rose Shox MR4 Mule, a pair of Tory Burch mules came in sixth place, New Balance trainers in eighth. And what was in fifth place? None other than the Birkenstock Arizona, of course. Perhaps the final hurdle for Birkenstock was to align itself with the feminine ideal – a space previously occupied by stiletto heels. Now, though, changes in attitudes around feminism and how feminist ideologies can be expressed through a woman’s clothing and appearance – yes, feminists can wear makeup! – has created a space for Birkenstock after all. In fact, this formerly frumpy shoe is now being perpetuated as the bastion of femininity. Don’t believe us? Simply take a look at the hottest film of the summer. At the end of Greta Gerwig’s stellar Barbie, our hero (played by Margot Robbie) has undergone a major emotional transformation that has seen her find a sense of purpose and identity. Gone are the feet once permanently raised so that they were perfectly positioned for a pair of heels. By the film’s conclusion, Robbie’s Barbie is an autonomous figure, a woman epitomising everything about contemporary feminism. And that includes having feet that are flat. Her footwear of choice? Why, a pair of pink Arizona Birkenstocks. Read More The grown-up guide to getting ‘balletcore’ right The Barbie press tour has finally rescued Margot Robbie’s red carpet reputation Birkenstock sandals are Barbie-approved – these are the pink styles to buy now Taylor Swift’s jacket from Chiefs game hints at Travis Kelce romance From choppy bobs to fox red, 5 celebrity-approved hair trends for autumn How Taylor Swift’s style has evolved over the years

Slack appears to have stopped working for millions of users around the world. Website health checker DownDetector registered thousands of reports of the office chat app not working. The outage began at around 9.45am BST, and comes just months after another significant issue with the platform. The Salesforce-owned company says that it has more than 200,000 paid customers, and is used by 77 of Fortune 100 companies. Those include many of the world’s biggest firms, such as Target, Uber and Netflix. More to follow. Read More New iPhone feature can recreate your voice perfectly after just 15 minutes Regulation ‘critical’ to curb risk posed by AI, boss of ChatGPT tells Congress Elon Musk calls working from home ‘morally wrong’

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Lewis Hamilton and Max Verstappen are among 10 drivers who will be absent from first practice at the Abu Dhabi Grand Prix on Friday. Last year, Formula 1 implemented a mandatory programme in which each car has to be driven by a rookie – defined as a driver who has started two or fewer F1 races – in at least one practice session per season. A lot of teams and drivers have left it to the 22nd and final race of the season to sit out, with Charles Leclerc, Lando Norris and Sergio Perez also missing out on FP1 at the Yas Marina Circuit. Formula E champion, 28-year-old British driver Jake Dennis, will fill in at Red Bull alongside F2 driver Isack Hadjar. Two British 18-year-olds will also be in the cockpit: Oliver Bearman will once again drive for Haas after making his F1 practice debut in Mexico last month, while Formula 3 runner-up Zak O’Sullivan will drive Alex Albon’s Williams car. Danish driver Frederik Vesti, currently second in the F2 standings ahead of this weekend’s finale in Abu Dhabi, takes Lewis Hamilton’s place. He also drove in George Russell’s car in Abu Dhabi. American driver Pato O’Ward will drive in Norris’ McLaren, while 2022 F2 champion Felipe Drugovich will fill in for Fernando Alonso on Friday. Israeli-Russian driver Robert Shwartzman replaces Leclerc at Ferrari . Jack Doohan and Theo Pourchaire, Alpine and Alfa Romeo junior drivers respectively, will also have a chance to impress in first practice. AlphaTauri are the only team not running a rookie driver on Friday, with Liam Lawson and Hadjar having driven in practice/race sessions already in 2023. McLaren’s Oscar Piastri and Williams’ Logan Sargeant are rookies anyway, so is not required to forgo a practice session this season. The purpose of the young driver programme is to give inexperienced drivers time out on track in an F1 car, as well as giving them the opportunity to build up the requisite super-licence points in order to compete in F1 in the future. Read More Hamilton ‘made contact with Red Bull and Ferrari’ before signing new Mercedes deal Guenther Steiner to produce new hit ‘workplace comedy’ show F1 Juniors broadcast an admirable idea – but all kids want to be is grown up

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