Merlot bikini underwear front on model B
model A wearing merlot red pair of sustainable non-toxic women's underwear back view
model B wearing merlot red pair of sustainable non-toxic women's underwear back view
model C wearing merlot red pair of sustainable non-toxic women's underwear back view
model C wearing merlot red pair of sustainable non-toxic women's underwear side view
close up of gusset on merlot red pair of sustainable women's underwear

Core Comfort Bikini

5.0
Rated 5.0 out of 5 stars
12 Reviews
$16.00
Shipping calculated at checkout.

Our bestselling everyday Bikini style designed for comfort all day long. Crafted in buttery-soft TENCEL Modal, the Core Comfort Bikini moves with you without bunching, riding up, or digging in.

Color
Color: Merlot
Size
Size: 2XS
Quantity
Quantity: 1 pack
Details

Silhouette: low-rise bikini with a subtle front scoop and no-dig waistband designed to flatter your body

Wear it low or hike it high: our scoop waistband locks a high-hip rise look in place

Adelfi’s Signature Gusset: Reinforced, sewn down, and 31% wider than other brands* for a superior, supportive fit

Tagless interior = no irritation

Fabric & Care
  • Body: 85% Lenzing TENCEL Modal, 15% Elastane
  • Gusset: 100% Cotton
  • All fabrics OEKO-TEX Standard 100 certified
  • Hand wash or gentle machine wash cold, delicate cycle
  • Lay flat or hang to dry
  • Do not bleach
Model Reference

JAEL - SIZE S 
Height: 5'5
Waist: 24
Hips: 36

KIMMIE - SIZE M
Height: 5'6
Waist: 26
Hips: 39

KIARA - SIZE L
Height: 5'4
Waist: 34
Hips: 46

Shipping & Returns

Free standard shipping on US orders over $75

  • Standard Shipping $8 / Free over $75 (3–5 working days)
  • Express Shipping $28 (1–2 working days)
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Pairs well with
woman wearing a black pair of sustainable non toxic underwear

A gusset worth talking about

Our gusset is 31% wider than the industry standard†

Fuller coverage, better fit, and intentional support where it counts.

side-by-side comparison of flimsy underwear gussets vs. Adelfi underwear gusset

Front wedgies? We don't know her.

Adelfi's underwear is sewn down to stay put

Our designs have built in support that sits flat and doesn't shift or bunch.

Stay cool & dry

We craft our underwear gussets with 100% cotton — the #1 fabric recommended by gynecologists†

Your most intimate area deserves the best. Breathable, absorbent, and gentle on sensitive skin.

Our fabric standards

OEKO-TEX® Certified Fabrics

Tested for 350+ harmful substances and free from PFAS, toxic dyes, and chemicals that disrupt your body’s natural hormone balance.

Lenzing TENCEL™ Modal

Made from sustainably sourced beechwood and produced in a closed loop system that reuses 99% of water and solvents.

Ethical & Small-Batch Production

Created in small batches with BSCI certified partners to minimize overstock and reduce waste.

OUR GIRLS KNOW BEST

Love Notes

5.0
Rated 5.0 out of 5 stars
Based on 12 reviews
100%would recommend this product
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12 reviews
  • JL
    Jessica L.
    Verified Buyer
    I recommend this product
    Usual underwear size M, S
    Usual pants size 6
    Height? 5' 6"
    Body type Athletic
    Common underwear frustrations Itchy/irritating fabric, Too narrow/uncomfortable gusset
    Size Purchased S
    Style(s) Purchased Bikini
    Rated 5 out of 5 stars
    1 month ago
    Love the cut!

    Honestly I thought I was ordering the high waisted bikini and was pleasantly surprised with the low cut of this style. If you are curvier, like me, and prefer a more modest look, I would recommend going with your true size or one up. I am a size 6 and ordered a S and when I order again I will go with a M.

    Fit AdviceRated 0.0 on a scale of minus 2 to 2
    ComfortRated 5.0 on a scale of 1 to 5
    Was this helpful?
  • BW
    Brea W.
    Verified Buyer
    I recommend this product
    Usual underwear size S
    Usual pants size 4
    Height? 5' 0"
    Body type Athletic
    Common underwear frustrations Rolling down/doesn't stay in place
    Size Purchased S
    Style(s) Purchased Bikini
    Rated 5 out of 5 stars
    1 week ago
    10/10!!!

    So much more comfortable than my expensive VS underwear!!

    Fit AdviceRated 0.0 on a scale of minus 2 to 2
    ComfortRated 5.0 on a scale of 1 to 5
    Was this helpful?
  • EZ
    Emily Z.
    Verified Buyer
    I recommend this product
    Usual underwear size M
    Usual pants size 8
    Height? 5' 5"
    Body type Hourglass
    Common underwear frustrations Visible panty lines (VPL), Front wedgies (cameltoe), Rolling down/doesn't stay in place, Too narrow/uncomfortable gusset
    Size Purchased M
    Style(s) Purchased Bikini
    Rated 5 out of 5 stars
    1 month ago
    Best Bikini Underwear I have EVER OWNED

    Holy COW!! Where to start with these amazing underwear! I have owned so many different brands and tried everything under the sun, some I thought were pretty good, until NOW. Adelfi truly hits a home run on mt underwear checklist and I have no notes. I was hiking at the beach and had these on with my atheltic running shorts and I felt like I was wearing NOTHING. They are so soft, don't bunch or get stuck in those unwanted places, I did not sweat, and the truly felt like nothing under my clothing, They fit beautifully which is rare for me with underwear and I couldn't have been more happy with these. Truly a dream come true in underwear. Not to mention my boyfriend thinks they look sexy on me and he loves. Not a piece of lace in sight, simple and sexy, he loves and I love. Woman approved and BOYFRIEND approved.

    Fit AdviceRated 0.0 on a scale of minus 2 to 2
    ComfortRated 5.0 on a scale of 1 to 5
    Was this helpful?
  • HH
    Helene H.
    Verified Buyer
    I recommend this product
    Usual underwear size XS
    Usual pants size 0
    Height? 4' 11"
    Body type Slim
    Common underwear frustrations Front wedgies (cameltoe), Rolling down/doesn't stay in place, Too narrow/uncomfortable gusset, Visible panty lines (VPL), Falls apart quickly, Overpriced
    Size Purchased XS
    Style(s) Purchased Bikini
    Rated 5 out of 5 stars
    1 month ago
    I'm never buying a different brand again

    Finally a wider gusset! Loved the tencel material because it felt like I was wearing nothing at all. It's been such a struggle for decades to find the right underwear and I feel like my hunt stops here.

    I typically wear an XS, so I purchased the XS sizes and it's still just a teeny tad looser on me. I'm going to try a 2XS when it becomes available to compare the two.

    Fit AdviceRated 1.0 on a scale of minus 2 to 2
    ComfortRated 5.0 on a scale of 1 to 5
    Was this helpful?
  • JC
    Jonah C.
    Verified Buyer
    I recommend this product
    Usual underwear size M
    Usual pants size 6
    Height? 5' 5"
    Body type Athletic
    Common underwear frustrations Front wedgies (cameltoe), Too narrow/uncomfortable gusset, Falls apart quickly, Overpriced
    Size Purchased M
    Style(s) Purchased Thong, Bikini, High-waisted Bikini
    Rated 5 out of 5 stars
    1 month ago
    Must have!

    This is seriously a must have! Great for everyday wear, so soft and doesn’t ride up at all!

    Fit AdviceRated 0.0 on a scale of minus 2 to 2
    ComfortRated 5.0 on a scale of 1 to 5
    Was this helpful?
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