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Siren Sweetheart Bikini Top - Black Rib


Color: Black Rib
Floral Haze
Green Rib
Cream Rib
Cup Size

This sweetheart is ready for your next sun-soaked adventure. The perfect long-sleeved bikini top for those sunny days when your sea errands require a little extra coverage. And yes, it has thumbholes.

Features + Fit

• Thumbholes
• Double-lined for zero see-through moments
• No removable padding
• Unique palm printed inner lining. (It’s not reversible! Just a fun lil’ surprise for your eyes only)
• Long-sleeved
• Sweetheart neckline
• Big, dramatic and adjustable bow
• Silicone-lined bottom band to keep everything in place (yay anti-slip!)
• Clean finish fabric for a no-pinch edge
• Gold logo hardware

Model Info

Collapsible tab content

Model Info
Model: Arlene Height: 5'9" Bust: 44" Bra: 38DD Waist: 37" Hips: 48 ½" Torso: 69" Arlene is wearing size 1X
Model: Kaylee Height: 5'4" Bust: 31" Bra: 34B Waist: 25" Hips: 36" Torso: 58.8" Kaylee is wearing size XS
Fabric + Care

Main: 74% Nylon, 26% Spandex
Inner Liner: 74% Nylon, 26% Spandex

Care: Please wash me cold and gently then hang me to dry, ok? Oh, and I don’t like bleach. Thank you ♥︎

Shipping + Returns

FREE SHIPPING in the U.S. on any order over $100!

Order amount: $0 - $99.99:
$7.95 U.S. shipping (+$2 for yoga mats or bags)
$13.95 International shipping*

Order amount: $100+:
FREE U.S. shipping
$19.95 International shipping*

*International shipping charges do not include customs and taxes which may apply in your country.

DELIVERY TIME: Please allow 5-8 days for delivery of your order if in the U.S. Please allow 2-5 weeks for international orders to arrive depending on each country's customs inspection and postal delivery practices.

RETURNS: We accept returns (excluding Final Sale items) within 30 days of purchase in unworn, unwashed condition with all tags and adhesive liners intact. U.S. returns will have a $5.95 return fee applied that covers the cost of shipping your return back, as we will be providing the shipping label. Your initial shipping charges will not be refunded, only the purchase price of the items you're returning will be refunded. For International returns, you are responsible for any shipping charges spent to mail your return back.

EXCHANGES: We offer free U.S. exchanges within 30 days of purchase to help you get your perfect fit (excluding Final Sale items). Items must be in unworn, unwashed condition with all tags and adhesive liners intact. Just select the exchange option and pick your new item from the available options in the drop-down menu. We offer exchanges for size, color, and style within that item's product category. At this time we are not able to offer exchanges for international orders as those must be returned.

Customer Reviews

Based on 81 reviews
Brynhildur Una Björnsdóttir
34 G

I bought the top in Medium, I didn’t like the fit for my boobs so I decided to buy a new one in large
I’m still waiting on that shipment
Though i worry it will be too wide then and not give any support
I feel like maybe the M would have worked if they didn’t put that wire in the neck line that holds the shape cause it’s not very bendable
If you have smaller boobs you might enjoy this one

Thank you for your review! Our design team will also take your feedback about the wire into consideration for future designs.

Favorite Swimsuit Top!!

This swimsuit top is the perfect item for your wardrobe! I have always been a fan of this company’s “Sweetheart Long Sleeve Crop Top,” and this top resembled that design.

I bought it in a small and an extra small, and I have to guess I did that because XXS was sold out at the time of purchase. My bust is 29 inches and normally I get XXS for the crop top, and when wearing this style of swim tops to the pool/beach, I’ve noticed it gets looser with wear. So, definitely purchase in a smaller size without worrying about the sleeves because they get looser too.

Regardless, I absolutely love this swimsuit. I recently wore it in late May to a girl’s trip in Cozumel, Mexico and it was perfect. Despite temperatures reaching the 90s F and very humid weather, this swimsuit top kept me cool after being submerged in water and kept me warm when the pool got too cool. I don’t care about the weird tan lines it gave me because I was extremely comfortable moving around and swimming in it, plus I know I looked cute while doing those activities.

My only con would have to be the clasp in the back. It’s hard to get on by yourself, and even after getting my friend’s help, she struggled to get it on. At times, I feared it wasn’t secure enough, thus I think that should be the only thing that could be improved about this product.

Overall, I’m happy with the two (Black Rib and Green Rib) I have. Don’t let the long sleeves discourage you from buying it, it’s perfect for hot summer days at the pool or beach because if it was perfect for Mexico, it’ll work everywhere else too.

(Side Note: I know I’ve attached a terrible photo of the top, but it’s the only photo I have of me wearing it.)

We're so delighted that you love it!

Ashley Langas
Got so many compliments on the unique design

I bought this to go on a recent trip to Kauai. I was stopped by a couple (woman was a photographer) who asked where my swim suit was from and complimented on the design. Lots of friends and family members also complimented me on the unique long sleeve design. This year’s sleeves were designed much better than last year’s. I have the black top from last year and said the sleeves felt too tight, and that seemed to be corrected with this collection. This is my favorite top when I don’t want my arms to tan

You looked great in it! No wonder you received those lovely compliments. We're delighted that our top has become your favorite for sun protection while still looking stylish!

Heart eyes!

Y'all are making me want more of these swimsuits...!! I wasn't sure about the long sleeves, as I fear it'll be too hot in the summer when you are not in the water, but it was so cute I gave in. I have not tried it in the water yet so if it doesn't perform well I'll update my review, but for now I'm in loooooooooove. I was scared the top would not cover enough of my boobs as it looks quite small, but it does! The fit is perfect, true to size. I'm a little scared for the bow, I hope it won't come undone in the water - we'll see. I'll update if it does. I feel like it's suuuuuper flattering. Surpisingly, my boobs are not spilling out and I feel like they are safe enough. The fabric feels nice and thick, and on me, it doesn't seem to be rolling on itself. I feel like the sleeves in the thumbholes area are tighter than other Popflex designs (I have 2 other pieces with long sleeves and thumbholes), so I hope they will be comfortable, but it feels ok still. I do feel like the fabric is maybe a little thick, you might indeed get hot in it, but again, I have not tested it yet. But yeah, I'm kind of in love, I didn't really want two piece swimsuits anymore but the pieces I purchased make me feel comfortable enough to wear a two piece swimsuit. It's soooo cute and I definitely recommend!

Thank you for trusting us and for recommending our product. Happy swimming!

Heather L
So dreamy!

I love how this top looks on me! The sleeves are a little long on my baby arms, but that's something I'm used to and can work around! Can't wait for my vaca to show this off!

Thank you for the glowing review!

Wild noodles
From a big gorl.

Alright, I'm reviewing this as a 6ft, 300lbs woman with 46DD honktilgalonbonkers.
I ordered a 3x black top.

Pros: it's super cute, I like the little dip v in the front, I think the lining is cute and compliments the black well, I think the arm length and stretch it fantastic. It's solid, no nip nops here to tell everyone the temperature of the water because it's pretty padded there.

Cons: my back boobs are fighting for their lives, the little hook together part fought me multiple times, I have seems unraveling at the thumb holes, and the bottom jeeps tucking under the honksquonkers.

My true feedback of improvement (again I am just a large person with large squonktiglebongers and am not a designer). I think there would be a huge benefit to a send hook or tie in the back between the tie part and the hooking part. Like halfway between the two, for extra security of no flashing innocent bystanders when being a lil fish in the water. I also think it would benefit to make the bottom a little longer. My biggest concern is something untying or unclipping on the back.

I'm not trying to be a person to self volunteer, but I really think yall would benefit from some bigger customers getting a chance to try it and provide some feed back so that maybe clothing options can not only be height adjustable, but maybe figure adjustable. I'd love to help point a few things out on what I've worn or tried.

I love it and it's my fav swimsuit so far in my small swimsuit ownership. (My prior suits are like walmart and fighting for my life in either molded cup bikinis or the triangle ones of pain).

I did size up from a 2x due to having tonbinglebongers larger than the average fruit section, and I'm glad I did. So if you have some larges squonkondonklers, I may suggest sizing up.

Thank you for your honest review and for your suggestions. We will take note of this and let our design team know. Rest assured that the team is working hard on our products and big improvements that will be helpful for our customers.