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PureFlex Organic Cotton Racerback Sports Bra

Sale price$62.00
  • 92% buttery-soft organic cotton and 8% spandex
  • Made for everyday wear and low-impact movement
Size:
Sizing Chart

Measurements

All measurements are body measurements, in inches.

Size Bust Waist Hips
XS (0-2) 30-32 24-26 34-36
Small (2-4) 32-34 26-28 36-38
Medium (6-8) 34-36 28-30 38-40
Large (10-12) 36-38 30-32 40-42
XL (14-16) 39-40 32-34 42-44
XXL (18-20) 41-43 35-37 45-47

Leggings and shorts lengths

Inseam is measured on the finished garment from the crotch seam to the hem. It's the same in every size, so you choose your size and your length separately.

Style Short Regular Tall
High Waist, Pocket, Mid-Rise, Sculpt and No-Front-Seam leggings 23" 25" 28"
Bootcut leggings 27" 29.5" 32"
Capri leggings 17"
High Waist and Pocket shorts 3" 5"

Which length for your height

A guide to where the hem lands, barefoot. Full length sits at the ankle; 7/8 sits just above it.

Your height Leggings (23" / 25" / 28") Bootcut
Up to 5'1" Short 23" for full length Short 27"
5'2"–5'4" Regular 25" for full length, or Short 23" as a 7/8 Regular 29.5"
5'5" Tall 28" for full length, or Regular 25" as a 7/8 Regular 29.5"
5'6"–5'9" Tall 28" for full length, or Regular 25" as a 7/8 Tall 32"
5'10" and up Tall 28" sits just above the ankle Tall 32"

Capri 17" is a mid-calf crop on most heights. Between two lengths? The longer one gathers slightly at the ankle; the shorter one sits as a 7/8.

How to choose your size

Most styles run true to size. PureFlex and Pure are garment dyed and pre-shrunk, so choose the size you normally wear.

If you're between sizes, please size up for the best fit.

Need a different length? Change the inseam, not the size. Leggings come in three inseams and shorts in two, so a shorter inseam at your true size will fit better than a smaller size.

Shorts: check the measurements at your hip rather than the size you usually wear in shorts.

Bras and tops: your usual size for a secure fit, or size up if you prefer less compression.

Pure Lightweight Joggers: these fit closer than the name suggests. If you want a relaxed fit, size up.

Texas-Grown and EcoLuxe styles: use the measurements on the chart above.

Still deciding between two sizes? Email hello@purakai.com and we will help.

How to measure

Bust: around the fullest part of your chest, with the tape flat but not tight.

Waist: around your natural waist, where you usually wear your pants. Relax and leave about 1/4 inch of slack.

Hips: around the widest part of your hips and seat, usually about 2 inches below your hip bones.

Inside leg: from your crotch straight down to where you want the hem, barefoot. Compare it with the inseams above.

Color:Navy
Free 30-Day Returns & Exchanges

Wear Better. Save More. 15% off 2 • 20% off 3 • 25% off 4+
Discounts apply automatically at checkout.

Norrah P.Verified
1/4
7/1/2026
Love these - purchased in 3 colors. I hang dry and it's still perfect after a few washes. Feels so much nicer than synthetic material. Would definitely recommend.
Heather A.Verified
2/4
5/30/2026
I am a yoga instructor and wear yoga clothes every day. I loved the sports bra I received. It fits well and is super soft and comfortable.
Claire N.Verified
3/4
5/21/2026
Finally a supportive sports bra that's mostly cotton! Love it!!!
Jessica K.Verified
4/4
6/21/2026
Very comfortable and supportive. True to size.
PureFlex Organic Cotton Racerback Sports Bra - Navy - front view
PureFlex Organic Cotton Racerback Sports Bra Sale price$62.00
Independently tested for PFAS by Applied Technical Services, an independent testing laboratory: no PFAS detected, with total fluorine below 2 parts per million (October 2024).

Tested and Trusted

We had our bestselling leggings independently tested for PFAS by Applied Technical Services. Total fluorine, the limiting marker for the entire PFAS class, came back none detected at below 2 parts per million.

The report covers the main fabric of our organic cotton leggings, tested in October 2024, against a current industry threshold of 100 ppm. We publish the result rather than a blanket claim.

Why go the extra mile? PFAS are synthetic chemicals used to make fabrics stain and water-resistant, but they’re also known as “forever chemicals” because they persist in the environment and accumulate in our bodies. With PFAS linked to health risks, we made it our goal to guarantee skin-friendly comfort that eases your body and mind.

We use no DWR coatings and no fluorinated finishes anywhere in our line.

Frequently Asked Questions

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Customer Reviews

Overall rating: 4.1 / 5 from 19 reviews.

Customer photo review of PureFlex Organic Cotton Racerback Sports Bra

Comfortable! My go to sports bra is usually Lululemon, Like a Cloud (size 8 or 10). I usually wear it for pilates. This sports bra. This held up just as well! I ordered a medium and it fit well, slightly snug but still comfortable. I truly appreciate knowing I've made a healthier choice for my body by choosing Purakai!

PureFlex Organic Cotton Racerback Sports Bra

Love these - purchased in 3 colors. I'm 5'1 and 110lbs w/ a wider ribcage. Ideally, I'm probably a size between S and M, but ended up going w/ the S instead of hoping the M would shrink enough. I hang dry and it's still perfect after a few washes. Feels so much nicer than synthetic material. Would definitely recommend.

PureFlex Organic Cotton Racerback Sports Bra

Customer photo review of PureFlex Organic Cotton Racerback Sports Bra

Finally found a great sports bra that supports but doesn’t squish my boobs and the cut is just right. I love the fabric and how the bottom elastic is nice and snug and supports my lactating breast while the body provides support but also doesn’t squish. I tried mate the label ones and the cut was just bad. These aren’t too low and have a nice wide underarm area. I’ll definitely buy a few more. For reference, I am 5’2” and 115lbs about a 34C. I ordered a size S.

PureFlex Organic Cotton Racerback Sports Bra

I am a yoga instructor and wear yoga clothes every day. I loved the sports bra I received. It fits well and is super soft and comfortable.

PureFlex Organic Cotton Racerback Sports Bra

I’m usually inbetween a L or XL in most sports bras so I went with XL and the elastic around the waist felt a little uncomfortable after wearing for a few hours. Great to wear for a workout but I wouldn’t want to wear it all day. The feel of the fabric is very comfortable though!

PureFlex Organic Cotton Racerback Sports Bra

Great material and I wanted to love it. I got an XS because I'm very small, but it was too tight and rode up too high under my arms to be comfortable. A size S might have worked but they were sold out, so I returned the XS.

PureFlex Organic Cotton Racerback Sports Bra

Love the fabric and the structure. Unfortunately this bra is not made for anyone over a b cup- there simply isn’t enough material to cover or hold larger breasts. Thus my search for an organic cotton sports bra continues as most brands offering organic cotton clothing are not size inclusive.

PureFlex Organic Cotton Racerback Sports Bra

It is much too thick and too big of a profile

PureFlex Organic Cotton Racerback Sports Bra

Store owner replied: Hi Martha, thank you for the review. I looked up your order, and I don't see a return. We offer free 30-day exchanges and returns, so you can return it for a full refund or exchange it for something else. We want you to be happy with your purchase.