Fly-By 3'' Running Shorts
Product code: T248983S
About this style
Experience next-level comfort with these Fly-By 3'' running shorts from Under Armour. They're cut in a regular fit with split sides for unrestricted movement during your workout, whether you're hitting the gym, track, trail running, or going for a jog. The elasticated waistband features an internal drawcord for a secure, adjustable fit. Made from lightweight, breathable fabric, they wick away moisture and dry quickly to keep you feeling fresh during athletic training sessions, even when things get sweaty. Practical details include an invisible zip pocket for your valuables and mesh panels for enhanced ventilation, making them ideal performance activewear and sport apparel for any active pursuit. These comfortable athletic bottoms are perfect fitness gear for the dedicated athlete seeking new levels of comfort and functionality.
Curated By
Details & care
Fit and style
•
Regular fit
•
Elasticated waist
•
Mid rise
•
No
Composition
Body - 100% polyester
Care
Machine wash according to instructions on care label
Delivery, collection & returns
Delivery
Standard
UK Standard Delivery is available for £3.99 or free on orders over £75 (excluding furniture).
Nominated Day
UK Next Day Delivery and UK Nominated Day Delivery (excluding Northern Ireland) are available for £5.99 (excluding furniture)
Collection
Collect from store
Store collection is free on all fashion, home and beauty orders.
Returns
UK returns
Free
Exclusions apply
Full delivery and collection informationOur returns policyAbout Under Armour
Train at your best, no matter the weather, with Under Armour's innovative clothing, footwear and accessory designs.
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Reviews (164)
Amazing
Originally posted on Under Armour
Yes, I recommend this
These shorts are amazing to run in, they don’t move, slide off, they’re not restricting with movement.
Helpful?
smaller in size
Originally posted on Under Armour
these are super comfy but on the smaller size for a 2x. would order again
Helpful?
I love that
Originally posted on Under Armour
Yes, I recommend this
So cute for summer workouts and walk sunsets I like so much really cute
Helpful?
fit like a xl
Originally posted on Under Armour
Yes, I recommend this
these fit like a xl instead xxl. they're still fairly comfortable though. i would order again, just size up
Helpful?
Replied
20 July 2026
Hi, there! So glad the comfort of our shorts was a homerun, but we're sorry the sizing was a swing and a miss. We know how frustrating that is, so please check out our size and fit guide for the measurements for each size so this doesn't happen again. And we'd love another swing at getting you into gear you'll love. Please look for an email from me on how we can.
Nice shorts
Originally posted on Under Armour
Yes, I recommend this
Light weight material, great fit , great to wear in 90degrees weather, very comfortable , true to size
Helpful?
Like the fit
Originally posted on Under Armour
Yes, I recommend this
Like the fit and look of shorts
Helpful?
instant love
Originally posted on Under Armour
Yes, I recommend this
Wore these for the first time and immediately knew I needed a second pair. They don’t ride up or slide down, are extremely comfy, and the pockets on either side meant I could move my phone from one side to the other when it got too warm. I wish they came in more colors!
Helpful?
Perfect fit!
Originally posted on Under Armour
Yes, I recommend this
Perfect fit and very comfortable. They were exactly as described and even more.
Helpful?
No pockets!
Originally posted on Under Armour
No, I don't recommend this
I was all excited when I got these because I have so many of them. All of those have pockets. To my disappointment, I put these on after washing, and there's no pockets!! I mean, there's a little zipper pouch that could fit 3 quarters (coins), but what am I going to do with that?!
Helpful?
Replied
25 June 2026
Hi! We totally get how surprising (and frustrating) it is when you’re expecting those go-to pockets and they’re not there. We're extremely sorry for the disappointment, that's never the experience we want for you. If you’re searching for a similar style with pockets, I'd be happy to help you find something that feels just right. I'll reach out to you shortly!
Good but Need to Revert back to previous design
Originally posted on Under Armour
No, I don't recommend this
I am not happy with the new design that has one zipped outside pocket. The old design has two outer pockets and one small inner pocket for keys or AirPod. Please change back to the old design though I like the short in general.
Helpful?
Very flattering, nice fit
Originally posted on Under Armour
Yes, I recommend this
These shorts are the perfect length, soft, nice fit and very flattering. I ordered a small and I am 5'2, 130 pounds, athletic build.
Helpful?
Shorts
Originally posted on Under Armour
Yes, I recommend this
Love love these . They were so comfortable and fit so well. Definitely recommend
Helpful?
Super cute!
Originally posted on Under Armour
Yes, I recommend this
These are really comfortable and fit well. My daughter was jealous I didnt get a pair so I guess I will be buying another.
Helpful?
Great fabric!
Originally posted on Under Armour
Yes, I recommend this
I like the fabric very light weight fabric. The length is perfect. like the colors offered in this short.
Helpful?
Bring back the pockets!
Originally posted on Under Armour
Yes, I recommend this
Love these shorts. They have consistently been my go to for running. However, I have to be able to stash a phone in a pocket. They no longer have the pockets that are big enough to carry a phone. Have had to move on to another brand.
Helpful?
Replied
26 May 2026
Hey there! Your go-to running short for years and we go and take away the pockets. We hear you and we're sorry about that. The Fly-By redesign went in a more minimal direction but we know that doesn't work for everyone who needs to carry a phone on a run. The UA Launch shorts might be worth a look as they offer a larger side pocket built for your phone. Keep an eye out for an email from us!
10/10 purchase
Originally posted on Under Armour
Yes, I recommend this
This is my 3rd pair of these shorts and they're super reliable and comfortable for everyday wear. Love the array of colors and they fit true to size. Great for being inside lounging and outdoor yard work or walking around
Helpful?
Great for summer
Originally posted on Under Armour
Yes, I recommend this
Great for lounging around the house or for cardio. True to size and very comfortable
Helpful?
Love these shorts
Originally posted on Under Armour
Yes, I recommend this
I ran a 5k in these shorts, and they were very comfortable and light weight. They also dry verify quickly. I am a huge fan and plan on purchasing more when the time comes.
Helpful?
Great shorts for running
Originally posted on Under Armour
Yes, I recommend this
I love these shorts for my runs. I usually chafe and shorts ride up but these do not. Great length, make sure to measure yourself, it helped! They are just loose on the top but I have smaller waist and curves.
Helpful?
Perfect fit
Originally posted on Under Armour
Yes, I recommend this
These were a perfect fit, well described. The pockets are functional and the shorts did not rise when working out and running in them.
Helpful?
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