Kinetic Adjustable Sports Bra, Black - Thirdlove - Polyester/Spandex

Need help with sizing? Take the Fit Quiz or Chat with a fit stylist

Kinetic Adjustable Sports Bra

$78

4,750 Reviews

Rated 4.4 out of 5 stars from 4,750 reviews

Kinetic Adjustable Sports Bra

$78

4,750 Reviews

Rated 4.4 out of 5 stars from 4,750 reviews

Product Details

Crush your goals, not your girls. No squishing. Total support.

Black may come without branding across straps
Wireless built-in cups
Adjustable, tagless back closure
Adjustable straps
2 in 1 styling: wear x-back for more support

Size & Fit

32-44 A-H
For best fit, half cups should size down to the next full cup size.
Stable compression plus encapsulation
Up to medium impact for E cups & up
Up to high impact for C-D cups

Bra Size Calculator & Chart

Thirdlove offers over 60 bra sizes from 32 to 44 band and bra cup sizes from AA to H cup, including our exclusive half cup sizes. Using your current bra size as a starting point, you can refer to the bra cup size chart below to refine your fit.

Bra Size Calculator & Chart

How To Use The Bra Size Chart

When using the chart to find your bra size, keep in mind:

The band size increases as you move from left to right. Move left or right within the row if your band doesn't fit.
The cup size increases as you move from top to bottom on the chart. Move up or down the columns if your cups don't fit. In between cup sizes? Go up or down a half-cup! And keep in mind if you want styles that are full coverage or not!
Bra sizes that share a row are sister sizes, meaning they share the same cup volume (though they have different cup letters). For example, at a glance they’re all just different bra sizes. However, the row with bra sizes 36C, 38B, and 40A have something in common: they all have the same cup volume but have different band sizes. The same goes for the row with bra sizes 38H, 40G, 42F, 44E, 46D, and 48C.

Measure snugly around your rib cage (underbust) and around the fullest part of your bust, in inches. Step 1 gives your band. For step 2, subtract your underbust from your bust and find the difference in your band's column. These are the sizes our Bra Size Calculator gives.

Step 1: Band size by underbust measurement (inches). Each range excludes its lower value and includes its upper value.
Underbust (in)	Band size
24.9 – 28.5	30
28.5 – 30.5	32
30.5 – 32.5	34
32.5 – 34.5	36
34.5 – 36.5	38
36.5 – 38.5	40
38.5 – 40.5	42
40.5 – 42.5	44

Step 2: Bra size by band and by bust minus underbust (inches). Each range excludes its lower value and includes its upper value.
Bust − underbust (in)	Band 30	Band 32	Band 34	Band 36	Band 38	Band 40	Band 42	Band 44
Up to 2.5			34AA
2.5 – 3	30B^*	32A^*	34AA^*
3 – 3.5	30C	32B	34A
3.5 – 4	30C½	32B½	34A½
4 – 4.5	30D	32C	34B	36A^*
4.5 – 5	30D	32C½	34B½	36A½
5 – 5.5	30E	32D	34C	36B	38A^*
5.5 – 6	30E½	32D½	34C½	36B½	38A½
6 – 6.5	30F	32E	34D	36C	38B
6.5 – 7	30F	32E½	34D½	36C½	38B½
7 – 8	30G	32F	34E	36D	38C	40B^*
8 – 9		32G	34F	36E	38D	40C	42B^*
9 – 10			34G	36F	38E	40D	42C	44B^*
10 – 11			34H	36G	38F	40E	42D	44C
11 – 12				36H	38G	40F	42E	44D
12 – 13					38H	40G	42F	44E

* Also the result when the difference is exactly 2.5 in: 30B, 32A, 34AA; 4 in: 36A; 5 in: 38A; 7 in: 40B; 8 in: 42B; 9 in: 44B.

The calculator only gives a size for an underbust over 24.9 in, up to 42.5 in, with a difference of up to 13 in. Blank cells and measurements outside these ranges have no size in the calculator.

Bra Size Calculator & Chart

Fabric & Care

88% polyester/12% spandex
Machine wash in cold, lay flat to dry
Use a lingerie bag for machine wash

Shipping & Returns

Perfect fit promise: Exchanges free for 60 days for all eligible orders. Please try on the bra to ensure a good fit, making sure to leave the original tags attached. We only accept underwear in unworn condition, with original tags, in its unopened original polybag. Items marked final sale are not eligible for return or exchange. If something’s not right, we can help. Our Fit Experts are available via live chat, or email to answer any questions you might have.

Complete the Look

Similar Loved Styles

What Our Customers Are Saying

Debra R. 10/20/26

Rated 3 out of 5 stars

Hi Hopes, not so much

It is so hard to find a good bra that fits ! This was tight so I bought an extender. hoping it will loosen up with time. I tried on my sisters and the same size was just right but hers has been worn for awhile. Rubs under my arm so I wont be buying another one. Straps are comfortable.

Cup Size

D

Fit

Runs small

Comfort

Average
Charlotte M. 09/29/26

Rated 1 out of 5 stars

Not for me

When I first put the bra on, the band felt very tight as compared to the bras I normally wear (34 DD). The loosest hooks were still too tight. Even considering that issue, I liked the bra initially. After time though, it became uncomfortable- especially under the sides of my breasts. I felt like I was not getting enough support and my breasts were kind of hanging over the band. I got some pinching on the sides, as well.

Cup Size

D 1/2

Fit

Runs small

Comfort

Poor
ANnie C. 09/30/26

Rated 5 out of 5 stars

Perfectly comfortable support!

I ride horses in Texas, so I am hot, sweaty, and bouncing around for hours. This bra is the best I have found for comfortable, breathable support and a nice shapely look. The girls look good while staying in place and I don't even notice the bra after 2 sweaty hours in the saddle. Will definitely buy more!

Cup Size

C 1/2

Fit

True to size

Comfort

Excellent
Danielle C. 10/07/26

Rated 5 out of 5 stars

Comfortable!

I like the fabric of the bra, it's super nice to work out in. Doesn't roll up in any way, and holds the girls steady. I have a tiny bit of popping out of the top, so I would've appreciated maybe 1 cup size bigger, but they don't carry it. Bummer. Either way I will be keeping it and wearing it every time I work out!

Cup Size

H

Fit

True to size

Comfort

Excellent
Tini 09/22/26

Rated 5 out of 5 stars

Great for Larger Cups - Just Bought a 2nd

I rarely write reviews, but just bought my 2nd of this style in a different color than the 1st because I love it. Bought my typical size (32F/32DDD) and I find them to be super supportive and prevent bouncing during cardio even though the item description says medium (not high) impact for larger cups. Also love that they are cute since so few bras with larger cups are pretty!

Cup Size

F

Fit

True to size

Comfort

Good

FAQs

What are the benefits of the Kinetic Adjustable Sports Bra?

The Kinetic Adjustable Sports Bra comes in bra sizes for a superior fit. It has adjustable, x-back convertible straps, and an easy on/off back closure so you’ll never get stuck in your sports bra again.

When is it best to wear the Kinetic Adjustable Sports Bra?

Any time you need active support and would think to put on a sports bra, you can wear the Kinetic Adjustable Sports Bra. Some folks even make it a “one bra day” and wear it under their work clothes so it’s even faster to sneak in a workout afterward. We’ve even heard from folks who like it as a supportive everyday wireless bra.

What size should I order in the Kinetic sports bra?

Our Fitting Room Quiz can tell you in less than 2 minutes. If you already know your size in a different ThirdLove bra, that is also your Kinetic Adjustable Sports Bra size. There is no need to size down to receive sport-worthy support.

What level of impact does the Kinetic sports bra support?

The bra-sized Kinetic Adjustable Sports Bra is rated as up to high impact support for C-D cups, up to medium impact for E cups and up.

Kinetic Adjustable Sports Bra

Kinetic Adjustable Sports Bra

How To Use The Bra Size Chart

How To Use The Bra Size Chart

Complete the Look

Similar Loved Styles

What Our Customers Are Saying

Hi Hopes, not so much

Not for me

Perfectly comfortable support!

Comfortable!

Great for Larger Cups - Just Bought a 2nd

FAQs