A: No. Tweak uses a premium elastic waistband engineered to Stay comfortably in place during movement without digging in or rolling.
Step 1 of 4
What size do you usually wear?
Pick what you normally take in underwear or activewear. No idea? Tap "I'm not sure" — no tape measure needed.
Step 2 of 4
How would you describe your shape?
This helps us fine-tune your size recommendation.
Step 3 of 4
How do you usually train?
We'll match you to the Tweak style built for how you move.
Your result
Recommended style for how you train
EverydayCoreEveryday seamless comfort
High SweatPulseLightweight for high-sweat training
PerformancePerformSecure support for strength sessions
All sizes — your fit highlighted
XS
Syour fit
M
L
XL
Fit FAQs
Q: Will the waistband roll down during a workout?
Q: Will it bunch or cave in when I sweat?
A: This is the problem Tweak was built to solve. The gusset uses a premium elastic construction that creates a snug, secure fit.
Q: What does the criss-cross stitching do?
A: The criss-cross stitching provides extra flexibility for movement in multiple directions.
Q: I'm between sizes — what should I do?
A: Size up for comfort. Size down for a snugger, more secure feel during high-intensity movement.
Q: How does it wash? Will it lose its shape?
A: Machine wash cold on a gentle cycle and air dry. Avoid tumble drying.
Size Chart
| Range | XS | S | M | L | XL |
|---|---|---|---|---|---|
| Core | AUD 8 | AUD 10 | AUD 12 | AUD 14 | AUD 16 |
| Perform | AUD 8 | AUD 10 | AUD 12 | AUD 14 | AUD 16 |
| Pulse | AUD 8 | AUD 10 | AUD 12 | AUD 14 | AUD 16 |
| Warm Up | AUD 6 | AUD 8 | AUD 10 | AUD 12 | AUD 14 |
| Range | XS | S | M | L | XL |
|---|---|---|---|---|---|
| Core | UK 8 | UK 10 | UK 12 | UK 14 | UK 16 |
| Perform | UK 8 | UK 10 | UK 12 | UK 14 | UK 16 |
| Pulse | UK 8 | UK 10 | UK 12 | UK 14 | UK 16 |
| Warm Up | UK 6 | UK 8 | UK 10 | UK 12 | UK 14 |
| Range | XS | S | M | L | XL |
|---|---|---|---|---|---|
| Core | US 4 | US 6 | US 8 | US 10 | US 12 |
| Perform | US 4 | US 6 | US 8 | US 10 | US 12 |
| Pulse | US 4 | US 6 | US 8 | US 10 | US 12 |
| Warm Up | US 2 | US 4 | US 6 | US 8 | US 10 |
⚠️ Warm Up Runs One Size Smaller
The Warm Up range is cut one full size smaller than Core, Perform, Pulse and Perform Hybrid. If you're a Core Small, order a Warm Up Medium