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Logo with letters 'T', 'W', 'E', 'A', 'K' in a stylized font with a pink and orange color scheme. Logo with letters 'T', 'W', 'E', 'A', 'K' in a stylized font with a pink and orange color scheme.
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Core
Core
Core
Core

Core

Regular price$29.99
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Size
 
 
This item is a recurring or deferred purchase. By continuing, I agree to the cancellation policy and authorize you to charge my payment method at the prices, frequency and dates listed on this page until my order is fulfilled or I cancel, if permitted.

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

The Everyday Heavy Hitter

Core is your go-to seamless underwear designed for everyday confidence. Sleek, invisible, and ultra-comfortable with premium construction that disappears under anything.

Features:

  • Seamless design - no visible panty lines (VPL)
  • Bonded, seam-light edges that disappear
  • Ultra-soft microfibre with four-way stretch
  • Breathable, premium all-fabric construction
  • Bamboo-lined gusset for comfort
  • Minimal coverage, maximum confidence

Available in Onyx (black) and Bare (nude).

Use collapsible tabs for more detailed information that will help customers make a purchasing decision.

Ex: Shipping and return policies, size guides, and other common questions.

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Let customers speak for us

from 253 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
Perform - Red
Perform - Red
Like finding gold

Where have you been, been looking for the perfect G for an outfit and these are perfect

Theo
07/27/2025
Warm Up - Nude
Warm Up - Nude
Gym approved

Completes my gym bag

Phoebe
07/26/2025
Ultra Classic
Ultra Classic
Legg day y approved

Love these,Look and feel amazing super comfy and stay put even during leg workouts

Anouk
07/25/2025
Aqua Pops
Aqua Pops

Love the fit, they just hug the body yet still can adjust the waistband for different outfits and looks

Hazel
07/25/2025
Ultra Classic
Ultra Classic
Invisable

Classic look and feel like you have nothing on.

Evie
07/25/2025
Black Classic
Black Classic
love

YAY gym bag complete, these are just what I was looking for and they stay where I put them even during a HIT workout

Asher
07/22/2025
After Dark
After Dark
Great selection

Honestly didn't expect them to be this breathable and light. Perfect for long gym days.

Esme
07/21/2025
Bare Bundle
Bare Bundle
Best

Had to try them and so glad I did they are better than expected, they fit great, feel amazing and do the job 5* +++

Cleo
07/20/2025
Warm Up - Black
Warm Up - Black
Tweak, keep them coming

I have already ordered more, they are great for any occasion

Kaia
07/20/2025
The Perform
The Perform
Great colours amazing fit

Love the colour range and how smooth they feel. I've already ordered more.

Atlas
07/19/2025
Aqua Pops
Aqua Pops
Tweak, keep them coming

already ordered more

Lyla
07/18/2025
Booty Shaker
Booty Shaker
YES

Just want I have been looking for, feel great and look amazing

Noa
07/18/2025
Aqua Pops
Aqua Pops
The Combo

Perfect mix of fit and fabric.

Grace
07/17/2025
The Combo
The Combo
Love this collection

I have been using just Tweak for 2 years now

Brontë
07/17/2025
Booty Shaker
Booty Shaker

Collection list

Perform G-String
Perform G-String
Perform  Hybrid
Perform Hybrid
Pulse
Pulse
Core
Core
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Core - Essential Everyday Underwear | Tweak