Gymshark and Sweaty Betty are the two most prominent UK activewear brands. They're in a similar price bracket, both emphasise quality over fast fashion, and both are available across most UK sizes. But if you've worn one and are considering the other, the sizing and fit differences are significant.
The fundamental difference in cut
Gymshark is cut for a narrower hip-to-waist ratio. The brand's heritage is bodybuilding and functional training — aesthetically, the leggings are designed to look sleek on a more athletic/straight silhouette. If your hip-to-waist differential is under 12cm, Gymshark fits well. Above that, you're sizing up for hips and accepting excess at the waist.
Sweaty Betty is cut for a more varied body. The Power Leggings specifically have a hip curve built into the pattern rather than relying purely on stretch. This makes them more forgiving for pear and hourglass shapes. The waistband is softer and more adjustable.
Price comparison
| Product type | Gymshark | Sweaty Betty |
|---|---|---|
| Core leggings | £40–£55 | £65–£110 |
| Sports bra | £25–£35 | £45–£65 |
| Shorts | £30–£40 | £50–£70 |
Sweaty Betty is significantly more expensive. The quality difference is real but not proportional — Gymshark's Seamless ranges are comparable in feel to Sweaty Betty mid-range.
Fit by body type
| Body type | Gymshark | Sweaty Betty |
|---|---|---|
| Straight/athletic | Excellent | Good |
| Pear shape | Size up one | True to size |
| Hourglass | Can be tight at hip | Usually good |
| Apple shape | Waistband can dig | More comfortable |
| Petite | 7/8 runs long | Offers petite range |
Which to choose
Choose Gymshark if:
- You have a straighter silhouette or your hip-to-waist ratio is under 12cm
- You want to spend less
- You prefer a tighter, more contoured look
- You train at high intensity and want performance compression
Choose Sweaty Betty if:
- You have a pear or hourglass shape
- Comfort over long sessions matters more than a tight fit
- You want better longevity (Sweaty Betty garments last longer in our community's experience)
- You prefer a more minimal aesthetic
The verdict
These are not interchangeable. For straight and athletic shapes at a lower price point, Gymshark wins. For pear and hourglass shapes where fit comfort matters over hours, Sweaty Betty justifies the price premium.
Use the Forre fit quiz to see which specific products from each brand have worked for women with your measurements.