Alta Medium Impact Sports Bra

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Lining Type | Light Lining

Color | Evergreen

Size | XS

Extended Sizes


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Alta Medium Impact Sports Bra

Regular Price
Sale Price
Regular Price
Sold Out
Unit Price

Lining Type

Light Lining





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Our most versatile sports bra.

Outside Magazine's Editor's Choice! Click here to read the article.

Gear Junkie's Best In Show! Click here to read the article. 

The Alta Medium Impact Sports Bra was created for flexible support with maximum breathability. 

Recommended for medium impact activities like hiking, mountain biking, pilates, etc...

To find your size, use a fabric measuring tape to measure the circumference around your rib cage right below your bust and around your bust at the widest point. 

The chart below is for our standard sizes XS-XL. If you find that you are at the upper or lower ends of the measurement range, you may want to consider our extended sizes which allow you to mix band and chest sizes. For more info on that, click here.

XS 29 - 31 27 - 31
S 31 - 33 30 - 36
M 33 - 35 35 - 41
L 35 - 37 40 - 46
XL 37 - 39 45 - 49


Lume Six Sports Bra Size Chart


Our wear-testers have found our sports bras to be true to size. If you like the fit of another sports bra you have that uses alpha sizing (small, medium, large, etc), we recommend ordering that size.

Sizing is subjective and preferences vary depending on the intended activity and personal preference. If you are unsure of your size, we offer free shipping + free returns so you can order multiple and return what you don't want to help make sure you find the right size.

DreamSupport fabric on front for ultimate support

FeatherAir fabric at back for maximum breathability

DreamSupport & FeatherAir fabrics are made from recycled materials to reduce our impact.

Lightly lined versions have ultra soft lining fabric that will conform to your natural shape. 

Unlined version is great for ultra lightweight and fastest drying times.



Machine wash cold with like colors and hang dry.

Do not bleach, iron or dry clean.

Comfort-Focused Features

Alleviate Straps

Engineered to lay flat so they won't bunch up and create pressure points on your shoulders. This allows for even distribution of weight and maximum comfort.

Halo Elastic Band

After designing and testing countless versions, we finally developed a band that lays flat while you're being active. Having consistent structure here without collapsing is important for creating the support needed.

Streamline Seams

Bonded seams minimize irritation by removing thread that can be abrasive. The seamless construction makes the sports bra feel like it disappears on you.

Customer Reviews
4.8 Based on 20 Reviews
5 ★
4 ★
3 ★
2 ★
1 ★
100reviewers would recommend this product Write a Review

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Ginger R.
United States United States
I recommend this product

Will never buy another sports bra again!

This bra has been a game changer for me, especially when I spend multiple days in the mountains. I used to have to bring multiple bras in order to ensure I always had a dry one after strenuous climbs- but this one dries so fast. It is very comfortable with enough support. When I recently became pregnant, I couldn’t imagine changing bras, so I ordered a size up and it still fits perfectly. Thank you for making such a great product!


Lume Six

Thank you so much!! What a compliment! We are so glad we can provide the support you need throughout life's many adventures :)

United States United States
I recommend this product
  • Fit Fits SmallTrue To SizeFits Large
  • Size Purchased XL no liner
  • Size Normally Worn XL

Sizing bit off

I think this bra has great potential. But 3 stars because the size chart was off and some gripes. I'm a 37 rib and 44 chest. XL should of been great. the rib is a bit uncomfortable and gets sweaty and I'm spilling out at the sides. I fluctuate 8-10 lbs. from winter to summer so I'm hoping it will eventually feel ok. The XXL is out of stock so I'm keeping the XL because it is still not bad. However, for the price it should be amazing and it is two steps up from my Champion $23 bra. I'll do another review once I am able to get an XXL which should be my size for all around for comfort. I really like the thinness and lightness. the shoulder straps design and placement do set it apart and justify the cost, but the rib cage band could be softer. I wish the cut near the armpits was higher/wider to keep the little bulge near armpit from popping out. You can even see it in the models. I felt like I kept wanting to pull the bra over it but not enough material to do so the way its cut. Maybe there is a reason for it, but it doesn't look or feel good. Maybe once I get the larger size, the gripes will feel better? I think this bra company will be around for a long time. They are on to something and have me as a customer. I'll keep watching for the larger size and try the high impact too.


Lume Six

Thanks so much for your feedback! It sounds like the Cirra High Impact may be the fit you are looking for since it is a higher cut on the front and sides. Looks like you have ordered it to try and we look forward to hearing what you think! The XXL's will be back in stock in a couple of months if you prefer to try a different size.

United States United States
I recommend this product
  • Fit Fits SmallTrue To SizeFits Large
  • Size Purchased medium medium large and large
  • Size Normally Worn medium or large

the Arc'teryx of sports bras

I am 36b with broad shoulders and a muscular back. I struggle with sports bras because my scoliosis and asymmetry can cause a lot of pain along the rib cage band. I sent an email into customer service asking fit questions and received the very prompt and detailed response about what might work for my scoliosis they even sent me two different sizes to try! I ordered a medium and a large and a medium/large. having the option of a few different rib cage versus bust sizes was incredibly helpful for someone with a disability like me I could customize the fit to my spine and that's what attracted me to lume six in the first place. every fit works the medium was a tight and beautiful sporty looking fit The medium large was nice with a larger band and the large was super soft and comfortable for day-to-day wear. I would recommend trying multiple sizes and just making sure you get it right or even having multiple sizes for different days where your body feels a little differently. The fabric is lovely the bra is incredibly lightweight and I can't wait to see more colors and styles come out awesome job would absolutely recommend to my friends and family.

Janaan Z.
United States United States
I recommend this product


Best bra I have ever worn - for any activity or even no activity. Love it!


Lume Six

So happy you have found a sports bra that works for you!! Truly the best feeling :)

Alixandra K.
United States United States
I recommend this product

The best most comfortable support out there!

This bra dries faster than anything I’ve ever worn and it’s totally comfortable for all day wear. Did I mention that the blue, ombré geometric pattern is super fly as well! Love this bra!


Lume Six

Yay!! Thanks so much Alixandra...we're thrilled that you love your sports bra!

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