Sweaty Betty Size Guide: What Size Am I in Sweaty Betty? Fit Advice & UK Sizing Help

Sweaty Betty is one of the UK’s best-known activewear brands—loved for its flattering leggings, supportive sports bras, and fashion-led performancewear. But as the brand grows globally, one question comes up time and again:

What size am I in Sweaty Betty? Does it run big or small?

✨ Tellar.co.uk helps you find your correct size in thousands of brands, including Sweaty Betty. You’ll get a free tape measure, create a one-time profile, and get instant size advice across leggings, bras, tops, and jackets. Always free. No size charts. No stress.

This guide explains how Sweaty Betty sizing works, how it compares to UK high-street sizes, and what to expect from different categories—so you can shop smarter and perform in total comfort.

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About Sweaty Betty: Fit, Function & Fashion

Founded in London in 1998, Sweaty Betty redefined women’s activewear by combining:

• Technical fabrics with flattering cuts

• Seamless gymwear with streetwear styling

• Styles for yoga, running, HIIT, ski, Pilates, and recovery

• Inclusive sizing (UK 6–24) and category-specific support levels

From bestselling Power Leggings to oversized after-class hoodies, Sweaty Betty caters to every workout—but that means sizing can vary depending on stretch, compression, and activity type.

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Is Sweaty Betty True to Size?

Sweaty Betty generally runs true to size, but compression leggings, sports bras, and swimwear can feel snug—especially if you’re between sizes or prefer a relaxed fit. Casualwear and outerwear tend to run roomy and relaxed.

Fit Overview:

• Leggings – true to size, high compression

• Tops & vests – true to size, fitted at bust

• Sports bras – may run small; support levels vary

• Outerwear – relaxed, layer-friendly fit

• Loungewear & jumpers – oversized by design

📏 Use Tellar’s Store Size Lookup Tool to find your exact Sweaty Betty size instantly—based on your bust, waist, hips, height, and intended use.

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UK High-Street Comparison

🎯 Create your Tellar profile to get personalised Sweaty Betty size recommendations—across leggings, tops, bras, and more.

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Sweaty Betty Sizing by Category

1. Leggings (Power, Super Sculpt, Zero Gravity)

The brand’s hero product—built for style and performance.

• Fit: True to size with compression

• Size Tip: Size up if you’re between sizes or prefer a lighter hold

• Tellar Tip: Tellar matches waist, hip and rise to fabric tension and cut

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2. Sports Bras (Ultra Run, Stamina, All Train)

Designed by activity—yoga to high-impact running.

• Fit: Fitted; support level affects stretch

• Size Tip: Size up in high-impact bras or if fuller-busted

• Tellar Tip: Tellar calculates bust + underbust to recommend the ideal support level

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3. Vests, Tops & Tees

Performance fabrics, mesh panels, relaxed knits and cropped cuts.

• Fit: Fitted in technical tops, relaxed in cotton/oversized cuts

• Size Tip: True to size; size up for looser feel

• Tellar Tip: Tellar adjusts sizing based on bust width + length preference

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4. Outerwear (Puffers, Running Jackets, Raincoats)

Windproof, waterproof, breathable and stylish.

• Fit: Layer-friendly and true to size

• Size Tip: Stick with your normal size

• Tellar Tip: Use the layering toggle in your profile for accurate outerwear sizing

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5. Loungewear, Joggers & Hoodies

Brushed cotton joggers, fleece-lined sweatshirts, cropped jumpers.

• Fit: Oversized by design

• Size Tip: True to size or size down for fitted look

• Tellar Tip: Length, shoulder and sleeve width considered in Tellar’s loungewear sizing

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Why Sweaty Betty Sizing Can Be Tricky

Sweaty Betty pieces are engineered for performance—which means:

• Compression fits may feel tighter than expected

• Support levels aren’t always listed clearly online

• Fabric stretch varies by activity category

• Petite or tall frames may struggle with inseam or crop length

• Sizing can change between core, seasonal, or limited-edition drops

That’s why Tellar.co.uk uses actual product data and your body shape to give size recommendations that work—every time.

🎁 Every new Tellar profile comes with a free measuring tape so you only ever need to measure once.

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Popular Sweaty Betty Styles (and How They Fit)

⭐ Power Leggings

Full-length with side pockets and bum-sculpting seam

• Fit: True to size, medium-high compression

• Tellar Tip: Waist and thigh width used for perfect hold without digging

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⭐ Stamina Sports Bra

Seamless and sweat-wicking, medium impact

• Fit: Fitted, snug underband

• Tellar Tip: Bust and ribcage circumference matched to support needs

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⭐ After Class Hoodie

Oversized fleece-lined pullover

• Fit: Very roomy

• Tellar Tip: Select relaxed or fitted preference in your profile

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⭐ Zero Gravity Running Leggings

Sleek, lightweight, bonded seams

• Fit: Sculpted and aerodynamic

• Tellar Tip: Tellar accounts for movement range and rise

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Related Tellar Sizing Guides You Might Like

• Lululemon Fit Guide

• Nike Sizing Breakdown

• Adidas Fit Explained

• Fabletics Size Guide

• How to Measure for Activewear

Explore all our brand guides via the Tellar blog or check your Sweaty Betty size now.

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Final Verdict: What Size Am I in Sweaty Betty?

You’ll likely wear your usual UK size in most pieces, but compression leggings and sports bras may feel snug, especially in high-impact or performance-focused collections.

Instead of guessing, let Tellar.co.uk do the work. We match your body to thousands of brands—including every Sweaty Betty item in your basket.

✅ Free tape measure

✅ One-time setup

✅ Fabric, fit and activity-specific size advice

✅ Always free

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✅ Ready to Find Your Sweaty Betty Size?

• Create Your Free Tellar Profile

• Check Your Sweaty Betty Size Instantly

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