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An in-depth review of the Runderwear Easy-On Running Bra.

There is nothing more frustrating than running in an ill-fitting sports bra, and our bigger-busted sisters have a much harder time finding a bra that is supportive, subtle, and doesn’t feel like boob prison. But it doesn’t have to be that way! Enter the Runderwear Easy-On Running Bra ($80).

In our best sports bras for running guide, our testers rated the Runderwear Easy-On Running Bra as the best for bigger-chested runners. As we’d all like to cut down on the pain experienced while running — back pain from an unsupported chest in particular — we’re very happy the Runderwear Easy-On Running Bra is here in the mix.

Runderwear Easy-On Running Bra front view. All photos: iRunFar/Michael Harris

Runderwear is a British company that makes a variety of running underwear and base layers; but where they have really excelled is in crafting supportive and comfortable bras for larger bust sizes, say C cups and above. The Runderwear Easy-On Running Bra comes in cup sizes C to J and band sizes 28 to 42, so it works for anyone beyond our A and B cup sisters. For the smaller-chested women out there, check out the Runderwear Original Bra v5.

While it may not be the most stylish or flashy of bras marketed toward larger-busted women, what we care about most is its level of support and comfort, and Runderwear hits it out of the park with this bra.

We found the Runderwear Easy-On Running Bra to be incredibly comfortable. Made of polyamide and elastane, which is basically a nylon-spandex combo, the bra dries quickly, doesn’t hold sweat despite its higher level of padding, and eliminates odors well. It has flat-sewn seams so that, despite the fact that there are many seams in this bra, chafing is nonexistent.

Runderwear put a lot of detailed effort into the Easy-On Running Bra to make it comfortable and customizable. The shoulder straps are padded up front and on top, to once again prevent any chafing, and around back, they transition into a regular bra-style strap so you can give your chest an extra lift if needed. Two sets of hook-and-eye closures in the back add to the ability to customize — the tightness on the band and higher up on the back.

Runderwear Easy-On Running Bra side view.

Breasts move in a number of directions during workouts, and excess movement causes a lot of back pain for some runners. The padded encapsulation style up front in this bra ensures the bust is locked in place, and the wide and padded band section supports, but doesn’t suffocate.

Larger-busted women often need encapsulation-style support, where each breast is supported within its own cup, rather than smooshed down compression-style, and the Runderwear Easy-On Running Bra delivers in this aspect. While some women prefer to not emphasize their chest area, our larger-chested runners found this style of bra supported them better than the visibly minimizing compression style.

One thing we did find is that it can be a bit tricky to size the bra correctly, with some customer reviews saying they have to size up or down from their usual. Perhaps this is due to the variations between British and American sizing. Luckily, Runderwear has excellent customer service and helps with easy exchanges to try out different sizes.

The only downside we’ve found with this bra is the cost. At $80, support doesn’t come cheap. However, that price is pretty much in line with other high-support, highly constructed bras. And given how highly we rated this bra, it’s worth every penny.

The Runderwear Easy-On Running Bra is a lifesaver for women with larger chests, who often need intense levels of support to reach their full running potential. The comfort, attention to detail, adjustability, wide variety of sizes, and level of support are unmatched compared to other bras aimed at larger busted women — and so it comes out on top in this category in our best sports bras for running guide. If you’re a C cup or above, this bra will help you get out onto the trail to run longer, faster, and higher, without worrying about your sports bra at all.

[Editor’s Note: If you’re affiliated (i.e., an employee, ambassador, etc.) with a brand, please share your relation in each of your comments on this article. Thanks!]

Runderwear Easy-On Running Bra detailed side view.

Alex Potter is an Editor at iRunFar. Following a nearly decade-long hiatus from running after college, she has found a new love in trail running. As a photojournalist, Alex has reported throughout the Middle East and East Africa for publications like 'National Geographic,' 'The New York Times,' and 'The Washington Post.' She lives in Flagstaff, Arizona with her partner Pete and her two cats. View all posts by Alex Potter