What Is Sizing Like at Reebok?

By Ella Blake — Fashion Stylist | Tellar Fashion Hub — Always honest, unbiased & unsponsored

Reebok clothing runs true to size for most women's pieces, but their trainers tend to run large by about half a size — so if you're between sizes on footwear, size down rather than up. Get those two things straight and Reebok is actually one of the more straightforward sportswear brands to shop.

I have a properly nostalgic relationship with Reebok. I grew up watching my mum do step aerobics in a pair of Classic Leathers in the early nineties, and there's something about the brand's revival over the last few years that has genuinely delighted me. They've managed to do what so many heritage sportswear brands attempt and relatively few pull off — make the archive feel current without just sticking a trend label on something old. The Freestyle, the Classic Leather, the Club C — these are genuinely great shoes. And their apparel range has grown into something worth taking seriously too. But sizing questions come up a lot, particularly around their footwear, so let me give you the full picture.

A Bit About Reebok

Reebok was actually founded in Bolton, England in 1958 — which a lot of people don't realise, assuming it's an American brand. They became enormous in the 1980s on the back of the aerobics boom (they made the first dedicated aerobics shoe, which is a genuinely excellent piece of sporting history), before growing into a full sportswear and lifestyle brand. Today Reebok operates as an independent brand after being sold by Adidas in 2022, and they've leaned into their heritage aesthetic hard — to great effect. Their Classic Leather and Club C trainers in particular are strong competitors in the crowded retro-trainer market, and their women's activewear range has become increasingly credible alongside the bigger players.

Reebok Clothing: How Does It Size?

The good news for clothing is that Reebok is broadly true to UK size. They use standard XS–XL sizing (and sometimes XXL) rather than numerical UK sizes, so you do need to know your measurements to convert accurately — but once you do, they're reliable. A few things to flag by category:

Sports bras and crop tops — these run true to size but are cut for athletic support, meaning they're designed to be snug. If you're between sizes, size up for comfort rather than down. If you have a larger bust (D cup and above), go up one size and check the specific style's support level — Reebok's high-impact options in particular are cut close.
Leggings and tights — true to size and generally well-proportioned. Their waistbands are firm without being uncomfortably tight, which I appreciate. Petite wearers may find the length slightly long in regular sizes, so worth checking the inseam measurement before ordering.
Hoodies, sweatshirts, and outerwear — true to size and usually a comfortable, relaxed fit. If you want an oversized look (which is very on-trend for athleisure at the moment), size up one. If you prefer fitted, your standard size is right.
Shorts and tracksuit bottoms — true to size. Their running and training shorts have a comfortable elastic waist so there's natural flexibility, but use your hip measurement as the anchor point for anything with a more structured waistband.
Dresses and lifestyle pieces — Reebok's lifestyle clothing range (as opposed to performance) can run slightly more relaxed. True to size is fine as a starting point, but check the specific garment measurements if you're buying something more fitted.

Reebok Women's Clothing Size Conversion Table

Reebok LabelUK SizeEU SizeUS SizeBust (cm)Waist (cm)Hips (cm)XS6–832–342–480–8462–6687–91S8–1036–384–684–8866–7091–95M1240892–9674–7899–103L144210100–10482–86107–111XL164412108–11290–94115–119XXL184614116–12098–102123–127

Reebok Footwear: The Half-Size Issue

This is where it gets interesting — and where most of the sizing questions I field about Reebok come from. Their trainers, as a general rule, run approximately half a size large. This applies particularly to their Classic Leather, Club C, and Freestyle styles. What that means in practice:

If you're a standard UK 5, try a UK 4.5 first.
If you're a UK 5.5 and Reebok doesn't stock half sizes in a particular style, go with a UK 5 rather than a UK 6.
If you have wide feet, this changes the calculation — you may actually find that your true size or even a half size up gives you the width you need without the excess length.

The exception to this is their performance running shoes and training-specific footwear (the Nano X series in particular), which tend to run true to size because they're engineered with a more precise fit in mind. For lifestyle and heritage styles — the Classics, Club C, Freestyle — go half a size down as your starting point.

Reebok Women's Footwear Size Conversion Table

UK SizeEU SizeUS SizeFoot Length (cm)335.5521.63.5365.522.0436.5622.54.537.56.523.0538723.55.538.57.524.0639824.56.5408.525.0740.5925.57.5419.526.08421026.5

For heritage and lifestyle trainers, try half a size down from the table above. For Reebok Nano and performance running styles, use the table as-is.

My Styling Tips for Wearing Reebok

Reebok has had a genuine fashion moment — and earned it. Here's how I'd style their key pieces right now:

The Classic Leather trainer is doing a lot of heavy lifting in the elevated athleisure space. I've been pairing them with wide-leg tailored trousers and a crisp shirt for a look that sits right in that sweet spot between casual and considered. They work with almost everything — denim, midi skirts, even tailored shorts in summer.
The Club C is the slightly sleeker, cleaner sibling of the Classic Leather and works brilliantly with more minimal, monochrome outfits. Great with straight-leg jeans and a blazer if you want a grown-up trainers-and-tailoring moment.
For activewear — Reebok's leggings and sports bras are solid mid-market performers. If you're doing the matching set thing (and it's still very much a thing), they do some great co-ordinated pieces that are genuinely gym-functional rather than just aesthetic.
Layering their hoodies under oversized coats is a brilliant winter move right now. A Reebok oversized hoodie under a structured wool coat is one of my go-to looks for clients who want comfort but refuse to look sloppy.

Brands in the Same Space — And How They Size

Whether you're after the heritage trainer look or the broader activewear aesthetic, here are the brands I'd put alongside Reebok:

High Street & Mid-Market Options

Sweaty Betty — a British premium activewear brand that has been quietly dominating the "looks good at the gym and for brunch" category for years. Their leggings in particular are exceptional — sculpting, supportive, and come in a brilliant range of lengths. They size in XS–XL and run broadly true to size, with a slight lean towards a more generous cut through the hips than many activewear brands.
Lululemon — the gold standard for activewear at the premium end of the mid-market. If you've never tried a pair of Lululemon Align leggings, I'm genuinely not sure what you've been waiting for. They size in numerical UK sizes (6–18) and run true, though their waistbands are specifically designed to sit high and firm, so check the rise if that's important to you.
Gymshark — the British activewear success story of the last decade. Brilliant for the high-performance, body-sculpting aesthetic, and they've improved enormously in terms of quality and range. Sizes in XS–2XL and tends to run true, though some of their more sculpting styles are deliberately close-fitting — check the reviews for specific styles.
Calvin Klein — their CK Performance and loungewear ranges hit an elevated, minimalist activewear aesthetic that pairs beautifully with heritage trainers like the Club C or Classic Leather. True to UK size and excellent quality for the price point.
Hugo Boss — their Hugo Active range is seriously underrated for elevated sport and casualwear. The quality and finish are noticeably above high street, and the aesthetic is clean and minimal in a way that works brilliantly with heritage sportswear brands. True to size.
Tommy Hilfiger — their Tommy Sport range is strong for the retro-inspired athleisure aesthetic. Bold branding, great colour combinations, and reliable true-to-size fits. A natural companion to Reebok's own heritage codes.
ASOS — worth checking for their own-label activewear range, which has a broad size range and competitive price point. Their 4505 activewear line in particular has had consistently good customer reviews for fit and durability. True to size as a general rule.
Abercrombie & Fitch — their YPB (Your Personal Best) activewear line launched a few years ago and has been quietly building a strong reputation. Well-made, flattering cuts with a slightly more fashion-forward feel than standard activewear. True to size.

Two Independent Picks Worth Your Attention

Varley — a London-founded premium activewear brand that I recommend constantly to clients who want something between Lululemon and full designer. Varley's pieces are beautifully made, thoughtfully cut, and have a distinctly elevated aesthetic — their leggings and bra tops work seamlessly from studio to street. They size in XS–XL and run true, with excellent size guides on their site. Not cheap, but genuinely worth the investment if activewear is a big part of your wardrobe.
P.E Nation — an Australian activewear label co-founded by Pip Edwards that has become a genuine cult favourite in the fashion press. Bold, graphic, unapologetically sporty in a way that feels very now — they reference 80s and 90s sportswear aesthetics in a way that sits perfectly alongside Reebok's own heritage revival. They size in XS–XL and run true to size. Not widely stocked in UK high street, but available online and increasingly at premium retailers. A brilliant find for anyone who wants their gym kit to feel genuinely fashion-forward.

🎯 Get Your Reebok Size Right — With Tellar

Between the half-size footwear quirk and the XS–XXL clothing labels that don't automatically translate to UK sizes, Reebok is one of those brands where knowing your actual measurements saves a lot of back-and-forth with returns. Tellar.co.uk matches your exact measurements to over 1,500 brands instantly — sportswear, heritage labels, high street, and designer all in one place.

Tellar is the UK's leading clothing sizing tool — completely free, unsponsored, and built on a database of 1,500+ brands. Here's how it works:

Measure once — enter your bust, waist, and hip measurements, or use an existing brand size you already trust.
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No more second-guessing between an S and an M. No more trainers that are just slightly too roomy at the toe. Just your measurements, matched to the brands you actually wear.

Find My Size at Reebok →

The Tellar Fashion Hub is also home to hundreds of honest, unsponsored posts covering everything from brand-specific fit guides to seasonal edit recommendations, body shape dressing, and wardrobe strategy. Written by stylists. Always free. Never influenced by who's paying.