Name: The Core Duo
Brand: Tweak
Price: 59.98 AUD
Availability: InStock

New-Core duo

In stock, ready to ship
Backordered, shipping soon

No VPL, no slip! if you nail your size. Check the Tweak G-string size chart and lock in your best fit.

Get your size HERE

Meet Your New Power Couple.

Why choose when you can have the best of both worlds? The Core Duo puts your essential black front and center. This bundle delivers 1 x Onyx (The Essential Black) and 1 x Bare (The Invisible Nude) in our upgraded, high-performance fit.

We’ve leveled up the comfort with a wider waistband that stays put and a longer triangle cut designed to sit higher on your hips for a flattering, leg-lengthening silhouette.

Stay Fresh: Signature moisture-wicking bamboo gusset.
Stay Dry: Breathable Coolon™ fabric pulls sweat away fast.
Perfect Fit: Available in sizes XS – XL.

1. What makes Tweak different from other athletic underwear brands?

We’re built for sweat, movement, and comfort. With premium performance fabrics, seamless construction, no VPL, and zero chafing, Tweak moves like a second skin. You focus on your workout – we’ve got your booty.

2. How do I know what size to order?

We’re true to size! But if you’re in between, size up for the perfect hug. For the Warm Up range, size up – it’s got that extra snug energy.

3. Can I return or exchange my order?

Totally. Returns within 14 days of delivery, tags on, unworn. You cover shipping unless it’s our bad (faulty item). Full details in our Returns Policy.

4. Do you offer free shipping?

Yep—free standard shipping in Australia for orders over AUD $100. Outside Oz? Fees apply based on your location. Check our Shipping Policy.

5. How do I place an order?

Click. Pick. Add to cart. Pay. Done. We made it ridiculously easy—shop like a queen and get back to your hustle.

6. How can I pay for my order?

Visa, Mastercard, Amex, PayPal, Afterpay (AUS only). Choose your fave at checkout.

7. Can I track my order?

Yep – once it’s shipped, you’ll get an email with tracking info. Keep your eyes on that inbox.

8. Is it safe to shop on your website?

Absolutely. We’re fully encrypted and PCI DSS compliant. Your info stays safe and sound.

9. Do you ship internationally?

Yes, we ship worldwide! Shipping costs + delivery times vary. You’ll see options at checkout.

10. What if I receive a faulty or damaged item?

We’ve got your back. Email us at support@tweakmeonline.com and we’ll replace it or refund you—no worries, no drama.

11. How do I care for my Tweak underwear?

Cold wash, gentle cycle, air dry. Skip the softener and bleach. Treat them like the luxury they are.

12. Do you sell gift cards?

Yes – digital gift cards are available on our site. Choose the amount, and boom – instant gift card via email.

13. How do I know if a product is in stock?

If it’s sold out, you’ll see “Out of Stock” on the product page. Hit the waitlist to get notified when it’s back.

14. Can I change or cancel my order?

We move fast. Once your order’s in, it starts processing. Contact us ASAP and we’ll do our best to help.

15. Still need help?

We’re always here for you. Drop us a line at support@tweakmeonline.com.

🚚 Shipping & Delivery

💌 How Much Is Shipping?

We keep it simple and speedy:

Australia: $10 flat rate with Australia Post or trusted local couriers

Everywhere else: Is calculated at checkout based on your location (because your booty deserves premium delivery)

⏳ When Will My Order Arrive?

We hustle hard to get your order out fast:

Within Australia: Usually lands in 3–5 business days

International: Up to 14 days depending on where you are in the world

Heads up: Global shipping’s still a little funky post-pandemic, so a few delays may pop up here and there. We appreciate your patience (and your excellent taste in underwear).

📦 Will I Get a Tracking Number?

You bet. As soon as your order ships, we’ll ping your inbox with tracking info.

Didn’t get it? Hit us up at support@tweakmeonline.com.

Pro tip: All parcels come with authority to leave—so if you’ve got specific drop-off instructions, let us know at checkout.

No PO Boxes, please. Make sure your delivery address is attended during business hours.

🚛 Which Courier Do You Use?

Australia: Australia Post or a local courier service

International: We choose the best based on your location.

💸 Will I Pay Extra Taxes or Duties?

If you’re shopping from outside Australia, local customs fees, import duties, and taxes may apply. These aren’t charged by us, so check with your local customs office if you're unsure.

Any questions? Don’t hesitate—drop us a line at support@tweakmeonline.com.

Your order’s in good hands—and soon, your cheeks will be too. 😉

[{"id":50681778733346,"title":"XS","option1":"XS","option2":null,"option3":null,"sku":null,"requires_shipping":true,"taxable":true,"featured_image":null,"available":true,"name":"The Core Duo - XS","public_title":"XS","options":["XS"],"price":5998,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":"","requires_selling_plan":false,"selling_plan_allocations":[]},{"id":50681778766114,"title":"S","option1":"S","option2":null,"option3":null,"sku":null,"requires_shipping":true,"taxable":true,"featured_image":null,"available":true,"name":"The Core Duo - S","public_title":"S","options":["S"],"price":5998,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":"","requires_selling_plan":false,"selling_plan_allocations":[]},{"id":50681778798882,"title":"M","option1":"M","option2":null,"option3":null,"sku":null,"requires_shipping":true,"taxable":true,"featured_image":null,"available":true,"name":"The Core Duo - M","public_title":"M","options":["M"],"price":5998,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":"","requires_selling_plan":false,"selling_plan_allocations":[]},{"id":50681778831650,"title":"L","option1":"L","option2":null,"option3":null,"sku":null,"requires_shipping":true,"taxable":true,"featured_image":null,"available":true,"name":"The Core Duo - L","public_title":"L","options":["L"],"price":5998,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":"","requires_selling_plan":false,"selling_plan_allocations":[]},{"id":50681778864418,"title":"XL","option1":"XL","option2":null,"option3":null,"sku":null,"requires_shipping":true,"taxable":true,"featured_image":null,"available":true,"name":"The Core Duo - XL","public_title":"XL","options":["XL"],"price":5998,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":"","requires_selling_plan":false,"selling_plan_allocations":[]}]

View all
7 products

Let customers speak for us

from 254 reviews

My wife's new favorite underwear for workouts

I purchased a pair for my wife to try before purchasing multiple pairs.

She says these are her new favorite for working out and runs. The construction is top notch. She says they are very comfortable and better than most g-strings and athletic underwear she has tried. We are both underwear aficionados, and we recognize that the quality exceeds other premier athleisure underwear brands. We will definitely be purchasing more. They truly are seamless and comfortable. No VPL whatsoever.

Anonymous

12/09/2025