The Classic Vanishing G-String - Black
Smooth, no-show and designed for light-leak protection: the everyday G-string that quietly has you covered.
Find My Size
Where are you in your journey?
This shapes your sizing recommendation.
Which trimester are you in?
This helps us account for how much your body is still likely to change.
What is your current bra size?
Even if it doesn't fit quite right — we'll use this as our starting point.
Band CupLet's get you fitted properly
Get expert help by email
Bra fitting is part science, part feel — and when your body is changing (pregnancy, postpartum, post-nursing) it can be tricky to figure out alone. Send us a few details and one of our Fit Specialists will email you back with a personalised size recommendation. It's free, no pressure to buy.
How does the band fit?
Honest answers give us the most accurate size.
How does the cup fit?
No gaps, no spillage — you know what we mean.
Your recommended size
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BRIEF FEATURES
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Smoothing
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Leakproof
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Matching Set
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Sustainable
stage guide
The Classic G-String is Hotmilk's no-show mid-rise thong with a bonded microfibre front, soft lace back and built-in light-leak protection. Wide smoothing sides and a mid-rise cut create a flattering, supported feel, while the soft lace back adds a touch of allure. A discreet built-in liner provides lightweight protection from light leaks. Everyday underwear designed for comfort, confidence and a smooth finish under clothing.
Key Benefits
- Features: Smoothing bonded microfibre front with soft lace back and a discreet light-leak liner
- Style Fit: Mid-rise for a smooth, flattering silhouette with wide smoothing sides
- Brief Style: G-string | mid-coverage back
- Gusset: Lightweight liner designed for light leaks and everyday peace of mind
- Sizes: 10 (S), 12 (M), 14 (L), 16 (XL)
- Colour: Black. A timeless, confidence-boosting classic that pairs effortlessly with everything in your wardrobe
- Fabric: GRS Certified recycled polyamide lace, polyamide, elastane, polyester, cotton, PUL
- Certification: Oeko-Tex Standard 100 certified fabrics and trims
*For hygiene reasons, briefs cannot be returned or exchanged. Leakproof briefs should be changed when wet.
Who is this for?
For women who want a no-show thong with light-leak protection. Smooth under leggings, dresses and fitted tailoring, for everyday wear or whenever you want confidence without visible lines.
How the leakproof liner works
- Stays dry against your skin: a moisture-wicking inner layer pulls fluid away from your body so you do not feel damp.
- Locks it away: a soft cotton layer absorbs fluid and holds it in place.
- Stays protected: a built-in waterproof layer acts as the final barrier to help keep light leaks off your clothes.
Designed for light leaks. Not intended for heavy flow.
Complete the set
Pair with Refined, Luxe or Effortless Sculpt, or with your favourite Hotmilk nursing bra. Prefer more coverage? Try The Classic Bikini Brief.
Eco
The Classic lace is made from GRS certified recycled polyamide, with the same softness, durability and beauty as virgin lace, reclaimed from textile waste.
Free shipping applies to all orders throughout the UK over £50 with a 1-2 day processing time.
UK & EU Returns
Returns are complimentary with Checkout+ and are accepted within 30 days of delivery. You will have the option to either return for a refund or store credit.
Added Checkout+ at checkout? Your return label is on us, simply lodge your return and choose between a full refund to original payment method or store credit, free of charge.
No Checkout+? No problem, purchase your return label, then choose between a full refund or store credit with no additional fees or restocking charges.
Please note: the Checkout+ fee is non-refundable
Please see our dedicated Returns page for full details.
As a team of moms, we understand the importance of protecting the planet for future generations. We are committed to reducing our impact on the earth by creating beautiful products that are healthier for you, your family, and our environment. All Hotmilk garments are ethically sourced and go through rigorous testing to ensure the fabrics and hardware are safe and free from harmful chemicals.
Free shipping on orders over £50
Quick and easy 30-day returns
Worn, Loved & Shared
Common Questions on The Classic G-String
Everything you need to know about the leakproof liner, fit, and how it works
The built-in liner works in three steps — no pads or inserts needed:
- Stays dry against your skin — the inner layer wicks fluid away instantly so you never feel damp
- Locks it away — a soft cotton layer absorbs and holds fluid securely
- Nothing gets through — a built-in waterproof layer ensures nothing reaches your clothing
Designed for light everyday leaks — not for heavy flow.
Sizes 10 (S) through 16 (XL)
Fits true to size — choose your regular size
Between sizes? Size up for a more comfortable fit
Yes — the bonded microfibre front is seamlessly finished with no stitching lines or bulk. The wide sides and bonded edges mean nothing shows through under fitted clothing or tailoring.
For hygiene reasons, G-strings cannot be returned or exchanged. We recommend sizing true to size — if you're between sizes, size up.
