Flexvibe soft support maternity activewear in Core Color, daily comfort main product image

Flexvibe Maternity Adjustable String Bikini | Halter Triangle, Fully Adjustable, 9 Colors, S–3XL

Name: Flexvibe Maternity Adjustable String Bikini | Halter Triangle, Fully Adjustable, 9 Colors, S–3XL
Rating: 4.50 (4 reviews)

Bump-friendly maternity activewear with soft stretch for pregnancy, lounging, and daily movement.

$28.00

$28.00 $38.00

Buy 2 get 10% off - code FV10

ColorBlack

Size S M L XL 2XL 3XL

Find your fit

Size Guide

All measurements are body measurements in inches. If you are between sizes, choose the larger size for a more relaxed feel or the smaller size for a more held-in fit.

Maternity & Postpartum

Size	US	Bust	Under-bump Waist	Hip
S	4-6	34-36	29-31	36-38
M	8-10	37-39	32-34	39-41
L	12-14	40-42	35-38	42-45
XL	16	43-45	39-42	46-49
XXL	18	46-48	43-46	50-53

Start with your pre-pregnancy size, then size up when you want more room through the bump, belly, or hips.

Flexvibe Maternity Adjustable String Bikini | Halter Triangle, Fully Adjustable, 9 Colors, S–3XL

How To Measure

Measurements should be taken directly on your body.

Bust: Measure around the fullest part of your bust, keeping the tape level.

Under-bump Waist: Measure around the lower belly where maternity waistbands usually sit.

Hips: With feet together, measure around the widest part of your hips.

See more on our Size Guide.

Free Shipping over $30

30-Day Returns

The Flexvibe Maternity Adjustable String Bikini is a halter triangle cup maternity bikini with a fully adjustable tie structure and high-cut tied bottom, made from lightweight, skin-friendly, elastic fabric for beach vacations and water activities. The freely adjustable tightness fits different body types and accommodates your growing bump throughout pregnancy, while the lightweight, skin-friendly fabric provides no wearing burden for all-day beach comfort. Available in 9 colors, S–3XL.

Quick Fit Snapshot

Best for beach vacations and water activities
Fabric lightweight, skin-friendly, elastic — no wearing burden
Fit fully adjustable tie structure — fits different body types, S–3XL
Design halter triangle cup + high-cut tied bottom
Sizes S, M, L, XL, 2XL, 3XL · 9 colors

MaternityBeachPlus-SizeHalter TriangleFully Adjustable9 Colors

✓ Fully adjustable tie structure✓ Lightweight skin-friendly elastic✓ Plus-size S–3XL inclusive✓ 9 colors

Product Features

Adjustable Fit & Lightweight Fabric

Fully adjustable tie structure — freely adjustable tightness to fit different body types and bump sizes
Lightweight, skin-friendly, elastic fabric — no wearing burden for all-day beach comfort
High-cut tied bottom — elongates legs for a flattering beach silhouette

Halter Triangle Maternity Bikini Design

Halter triangle cup top — flattering, supportive coverage for beach and water activities
Plus-size inclusive sizing — S to 3XL for all body types during pregnancy
9 colors, S–3XL — Black, Red, Blue, Orange, Fuchsia, Lemon Green, Purple, Yellow, White

Size Guide

Available in S, M, L, XL, 2XL, 3XL. True to size. If between sizes or your bump is larger, size up.
View Full Size Guide →

Care Instructions

Hand wash cold or machine wash on gentle cycle
Do not bleach
Lay flat to dry in shade
Do not iron

FAQ

Is this maternity bikini available in plus sizes?

Yes. This maternity bikini is available in sizes S through 3XL, providing inclusive sizing for all body types during pregnancy. The fully adjustable tie structure also allows you to customize the fit for your specific body shape and bump size, ensuring a comfortable, secure fit for beach and water activities.

Can the tightness be adjusted as my bump grows?

Yes. The fully adjustable tie structure allows you to loosen the ties as your bump grows throughout pregnancy, making this bikini suitable for all pregnancy stages. Simply adjust the halter top and bottom ties to accommodate your growing bump while maintaining a comfortable, secure fit for beach and swimming activities.

Is this bikini suitable for water activities?

Yes. The lightweight, elastic, skin-friendly fabric is designed for beach vacations and water activities during pregnancy. The fully adjustable tie structure provides a secure fit during swimming and water sports, and the high-elastic fabric accommodates your movements in the water for comfortable, active beach wear.

Shipping
Free standard shipping on orders over $30. Most orders process in 1-2 business days and arrive in 7-10 business days.

Returns
Return unworn, unwashed items with tags and original packaging within 30 days.

Fit Snapshot

Soft room & gentle support

Maternity and postpartum activewear fit notes for stretch, belly room, coverage, and daily comfort.

Fit & size

Use the Size Guide and product photos to check fit, coverage, stretch, and where the style sits on the body.

Fabric & coverage

Review the product description and photos for fabric composition, stretch, lining, padding, pockets, opacity, and care. For lighter colors, check photo coverage before choosing underwear color.

Before checkout

Confirm the Size Guide, shipping timing, and return policy. Flexvibe describes fit, support, and visual smoothing only; we do not promise weight loss, body changes, or medical results.

Size Guide Sports Bras Maternity