Alta Medium Impact Sports Bra

Regular Price
Sale Price
Regular Price
Sold Out
Unit Price

Lining Type | Light Lining

Color | Evergreen

Size | XS

Extended Sizes


- +

Alta Medium Impact Sports Bra

Regular Price
Sale Price
Regular Price
Sold Out
Unit Price

Lining Type

Light Lining





Added to Cart View Cart or Continue Shopping.

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 25 Reviews
5 ★
4 ★
3 ★
2 ★
1 ★
Write a Review

Thank you for submitting a review!

Your input is very much appreciated. Share it with your friends so they can enjoy it too!

Filter Reviews:
Stefani T.
United States United States
I recommend this product

Lightweight Powerhouse

This bra is amazing! It is lightweight, yet holds everything perfectly in place. Most sports bras hurt my shoulders. This one does not! The fabric feels soft and thin yet it is still supportive. My college age daughter and I are very impressed. As a college athlete she has spent many hours wearing sports bras. She was so blown away by how light yet supportive it is. She is excited to order one for herself!

United States United States
I recommend this product

Dries so quickly, almost never feels sweaty! Seamless interior and good sizing too!

There is nothing worse than wearing a fancy high tech shirt that feels nice and dry no matter how sweaty you are, only to have a soggy sports bra. The Lume Six bras largely solve this problem! Despite being synthetic, they breathe and dry as well or better/faster than some nice merino wool bras I have. The standard size recommended by Lume Six's fit calculator fit me quite well with no need for modification. The seamless interior is also great, so smooth it makes it easy to forget I am wearing a bra.

United States United States
I recommend this product
  • Fit Fits SmallTrue To SizeFits Large
  • Size Purchased XL unlined
  • Size Normally Worn XL/XXL

Wanting to update my previous review!

I am a tough fit. 37,DDD (44), very broad shoulders and back. 5'7, 150 lbs. I tried the Alta and Cirra in XL, lined and unlined. I also tried the XXL in the lined Alta and Cirra. So right now the unlined XL Alta fits me the best. It does spill over on sides a bit but its still comfortable, supportive enough that I own 4 in unlined black. I bought so many because the unlined is going to be discontinued as most of you like the lined. I thought the XXL was going to be perfect and it was in the cup, but the band was too loose and gapped. the lined Cirra in XL being, high impact is like a straight jacket and the lined Alta in XL just too snug. Without the lining the Alta XL it seems to work good, not perfect but better than my current bras, even ones that are less expensive or similar. I returned, swapped, and tried to find all this out with the help of Lume Six. All with free returns and excellent customer service with Margaux's suggestions. They are going to become the best bra company someday. In my mind they already are. There are still small, but someday, my perfect bra will be a XL/XXL. I know they already have L/XXL in the works. I will definitely be buying both style bras when they come out with the bigger. I know they are sports bras but hopefully someday, you make a bra with the same material that has the shoulder straps fall away from the neck, only because in some t-shirts my band shows around the neck line. I'm sure its placed there for comfort but just thought I would mention it for future bras that may be produced for every day use and not athletics...even though I wear mine for everyday...ha! Thanks for all the help in trying to find me the perfect fit. I appreciate it so much.


Lume Six

Thank you so much for the updated review! It was a joy to get you the right size and we are so thrilled that you are happy with the results!! We'll keep you posted on the L/XXL sizing.

Sherry O.
United States United States
I recommend this product

Fast drying!

I biked for 8 days straight in the same bra! Every night I washed it out and hung to dry in my bathroom and it was ready the next day! I love the new Lupine color and I appreciate how lightweight it is! Love it!

Zephyr S.
United States United States
I recommend this product

my new go to ALL TIME FAVORITE

small chest, medium band?? Why has this never existed in such a perfect way until now! and then add on that it's the fastest drying bra I've ever worn, super light weight and insanely comfortable and boom, fan for life.

Join our mailing list

Sign up to stay up to date with the latest