How To Tell If UGGs Are Real: 12 Measured Checks

How to tell if UGGs are real starts with a ruler and a label: 17 mm wool pile, an 8 inch Classic Short II shaft, RN 88276 sewn inside the left boot.

UGG publishes the wool depth, the shaft height, the style number and the price for every Classic model. The FTC publishes the company behind the RN number on the label. Those two public records supply most of the cards on this page, and every figure came from one of them or from a named authentication guide. Nothing here depends on a comparison photograph, because copies improve faster than photographs age.

Run the four quick checks with the boot in your hand. Then measure the shaft and the wool. A boot claiming to be a Classic Short with a 7 inch shaft and 9 mm of acrylic pile has failed twice, and the hologram can wait.

UGG Classic Mini, Short, Tall and Ultra Mini: What Changes Between Models

The Classic line differs by shaft height, and shaft height is the fastest measurement to take. UGG lists the figure on each product page along with the style number and the price. Everything else on a Classic stays the same: 17 mm Twinface sheepskin on the upper, the lining and the insole, a suede heel counter, a rear pull tab and an EVA outsole.

Two details in that table do the work. The style numbers on current Classic boots run to seven digits, while the Tasman keeps a four digit legacy number. A Tasman labelled 1116109 is wrong before anything is measured. The second detail is the shaft gap. An Ultra Mini at 3.5 inches and a Mini II at 5 inches sit close together, so copies land between them. A boot measuring 4.25 inches is not a variant. It is a different pattern.

The Tasman is the outlier in materials as well as numbering. Its upper is suede rather than Twinface. The lining is either 17 mm sheepskin or UGGplush, made from upcycled wool and TENCEL Lyocell. The collar braid is UGGbraid in recycled polyester. UGG lists a Treadlite by UGG EVA outsole on that model. Applying a Twinface wool test to a Tasman therefore produces a false fail, which is why the model has to be identified before the ruler comes out.

The Classic Ultra Mini is the most copied of the group. Deckers took Quince to court in June 2023 over an ankle-high shearling boot sold at $69.90, arguing trade dress and design patent infringement over the silhouette and the exposed stitching. Quince moved for partial summary judgment in March 2025 and argued the features were functional and generic. That case is about a lookalike wearing its own name. Counterfeits are the other problem, and they wear the UGG logo.

Made in Australia: Why That Label Is Not Always a Counterfeit

Every other guide says the same thing: Made in Australia means fake. That is right for a boot carrying the UGG logo and wrong as a general rule, and the difference is worth knowing before you accuse a seller.

In Australia and New Zealand, ugg describes a style of flat-heeled sheepskin boot rather than a brand. IP Australia has held that position since 2006, when Uggs-N-Rugs kept the right to use the words after evidence showed they were the ordinary way to describe the footwear. Around 702 Australian trademarks contain the term. The trademark record shows Deckers holding protection for its own UGG logo rather than the word in that market.

The reverse holds in the United States, where UGG is a protected brand owned by Deckers Outdoor Corporation. In 2019 a Chicago court ordered Australian Leather to pay $450,000 in damages over 12 pairs sold to American buyers, and the Supreme Court declined the appeal. So the practical rule has two halves:

1. A boot with the UGG logo and a Made in Australia label is a counterfeit. Deckers does not make Classics there.
2. A boot from an Australian maker, sold under that maker’s own name, with no UGG logo anywhere, is a legitimate sheepskin boot. It is not UGG and it is not fake.
3. A boot with no logo at all but an Australian flag hang tag, sold as UGG, is a counterfeit using the country as the lure.
4. A boot bought inside Australia and marketed as ugg boots by a local brand is legal there and would infringe if imported and sold as UGG in the United States.

That distinction matters most on resale platforms, where Australian-made sheepskin boots turn up in UGG searches because sellers use the generic word. Judge the logo, not the country.

Labels, RN Numbers and the Security Sticker: What To Read First

The sewn-in label carries four fields that can be checked against public records in under a minute, which makes it the cheapest part of the boot to inspect. Work through them in this order:

1. Find the label inside the shaft, usually along the inner seam, and photograph it under good light.
2. Read the style number. Search it on UGG.com and confirm it returns the model in your hand.
3. Read the RN number. It should be RN 88276. Check it in the FTC RN database, which the agency keeps public so that shoppers can trace a label back to a company.
4. Read the country of origin. China, Vietnam, Cambodia, the Philippines and the Dominican Republic are the five that appear on genuine labels.
5. Reach into the left boot for the security label sewn behind the size label, then turn it a quarter turn under a lamp.

The RN field is the one almost nobody checks. The FTC explains that a Registered Identification Number is issued to US businesses handling textile, wool and fur products, and that a company may print it instead of its own name. UGG prints RN 88276 on its Classic Mini II, Short II, Tall II and Ultra Mini product pages. A copy that reproduces the hologram and the style number but prints a random RN fails a check that takes one search.

The security label deserves a caveat that retailers rarely give. UGG confirms on its own site that it sews security labels into the left shoe and puts security stickers on shoeboxes. Retail guides describe the label further. A holographic sun flips from black to white at 90 degrees. A QR code was added in autumn 2013, and 2012 and 2013 stock carried rolling 3D optics. The caveat is that counterfeiters reproduce the label. A missing label is strong evidence of a copy. A present, working label is weak evidence of a genuine boot.

UGG’s own counterfeit education page is worth reading for what it leaves out. It talks about stitching quality, shedding fur, odd colouring, suspicious domain names and prices set low to lure buyers. It names no hologram, no serial format and no label field. The brand’s published advice is therefore about where you buy, not about what you can measure, which is the gap this page fills.

Counterfeit UGG Boots: What Customs and the Courts Show

Counterfeit UGG stock reaches buyers in bulk rather than a pair at a time, which is why the price of a single listing tells you so little. Investigators serving an eviction notice on Long Island in 2016 found an assembly and distribution operation. They seized more than 3,660 pairs of counterfeit UGG boots worth about $700,000. The wider raid totalled over $1 million across several brands. UGG’s own enforcement page lists further cases, including an HSI seizure of $30 million in counterfeits in Boston and a crackdown on 2,500 counterfeit websites.

Those numbers explain where the risk sits for a buyer. Counterfeit UGG boots arrive by the thousand, cost the seller a few dollars a pair, and are sold at every price between $25 and full retail. A price near retail is not reassurance. It is the counterfeiter pricing to avoid suspicion. The same logic applies on sneaker marketplaces, and the StockX review on this site covers what platform authentication does and does not catch.

One more pattern shows up in the fakes: the insole. Genuine UGG insoles are pale beige on every colourway, because the sheepskin is used undyed. Copies commonly dye the insole to match the outer fur, so a black boot arrives with a black insole. That check needs no tools and no reference photograph, only a look inside.

Where To Get Your UGG Boots Authenticated

UGG does not offer a consumer authentication service. Deckers works with customs authorities and takes down counterfeit listings, but it will not examine a pair you already own and issue a verdict. Its published advice on the what you can do page is to buy from UGG.com, UGG retail stores or retailers listed in its store locator, and to report counterfeit sellers. That leaves owners of a suspect pair to do their own work.

The practical route is the return window. An authorised retailer will take back a pair that fails your measurements, which turns the purchase itself into the authentication step. Nordstrom, Zappos and Amazon shipped and sold by Amazon are named by retail guides as authorised channels. Resale platforms differ: some run photo review, few run physical inspection on footwear at this price, and none check a serial against Deckers records, because no public record exists to check against.

Photo services fill the gap before money changes hands. The other moulded-sole guides here run the same arithmetic: fake Crocs on a rivet and a sole stamp, fake Birkenstocks on a footbed. Legitly reads the heel label, the sewn-in label fields and the insole colour from your pictures and flags what does not fit the published specification. A photo cannot measure 17 mm of wool or put callipers on an outsole, so treat it as a pre-screen rather than a certificate. The UGG hub and the wider sneakers category collect the related guides on this site, including the Birkenstock checks that use the same ruler-first method on a different sheepskin and cork product.

Verdict: Measure Twice Before You Trust the Hologram

A genuine pair passes every card on this page, so one pass means little and two fails end it. Counterfeiters now spend their money on the parts buyers photograph: the heel label, the security hologram, the box. They spend far less on the parts buyers measure, because wool depth and pattern accuracy cost money on every single pair rather than once at the print shop.

Rank the checks by what they cost a copy factory. A printed label costs nothing. A copied hologram costs cents. A plausible style number costs one web search that the factory also skipped. Real 17 mm Twinface sheepskin costs real money per pair, and a correctly cut shaft costs a new pattern and new tooling. That is why the ruler beats the loupe on this product.

Two failures mean walk away. A Classic Short with a 7 inch shaft and 10 mm of glued pile is a copy, whatever the hologram does. A boot with a perfect security label, a dyed black insole and no RN number has failed twice on fields the seller never thought to check. An Ultra Mini at 4.25 inches matches no UGG pattern at any price. Treat any two failed cards as a counterfeit and keep your money, whatever the box, the tag or the story says.