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The Pearl Izumi Fly Split Short gives you wings so you can fly. Its unrestricted feel, 3/4 split and ventilation panels can only mean one thing: ultimate speed. Updated back envelope pockets allow you to securely stow nutrition and other essentials on the run. 


  • Black (021)
  • TrueRed (3DE)


  • Approx. 3" inseam, 11" outseam (size medium)
  • Mesh panels on back provide superior ventilation
  • 2 easy access back envelope pockets to stow small essentials (approx. 4"W x 3"H)
  • Elastic waistband with drawcord for an adjustable fit
  • Reflective Pearl Izumi logo and accents for increased visibility 
  • Three-quarter split for freedom of movement


  • P.R.O. Transfer fabric: Body (100% Polyester), a moisture-wicking fabric which quickly transfers moisture from your skin to the surface of the garment, keeping you dry and cool even as you perspire
  • P.R.O. Direct Vent Liner with Minerale: Liner (82% Polyester/ 18% Spandex), a breathable, anti-microbial fabric
  • Direct Vent: Mesh panels (82% Polyester/ 18% Spandex), a breathable, open fabric for ventilation
  • Gusset (50% Minerale Polyester/ 50% Polyester), a moisture-wicking, anti-microbial fabric

Apparel Performance Characteristics

Apparel Fit: What's this?

  • Compression
  • Fitted
  • Semi-Fitted
  • Relaxed

Temperature Range °F: What's this?

  • Cold
    • Below 30
  • Moderate
    • 30-45
    • 40-55
    • 50-65
  • Hot
    • above 65

Fabric Thickness: What's this?

  • Thin
  • Medium
  • Thick

Customer Reviews

Comments: I have the red; between sizes and went up one, as PI gear usually runs a little small. These seem true-to-size, though, and I probably could wear the M. Great feeling fabric that does indeed disappear a minute after you put them on. The liner initially seems of a heavier material than my other shorts (Mizuno, Nike, Brooks), but its nicely supportive and unnoticeable when wearing. The liner's leg openings are a little different from the usual elastic, and they sit well without chafing (even on hot, muggy 20-mile outings). I found the waist a little large relative to the rest of the short, making the drawstring a necessity and still leaving it slightly looser than I‚d prefer. Loading the back pockets (two ponderous Crank eGels and a car key), then, gives a sloppy feeling for a little while; the shorts arent actually falling down, but I worried for a couple miles that Id be mistaken for a plumber. All in all, I'd take advantage of RW's generous shipping policy and order your size and the next closest, returning the worse-fitting of the two. You'll love the shorts.
From: Clive, Charlotte, NC, USA

Comments: Seriously the best shorts around. Like the previous reviewer mentioned the liner is great. Covers everything unlike others where I'm hanging out in back. For the most part it stays in place I might have to adjust it once an hour. The waist band is another great feature. Its flat and doesn't leave me with marks and irritation like other shorts. The only problem with the waist band is it likes to sit a little bit higher then I would normally like but I like my shorts to sit low. As far as the outside its light and barley noticeable and doesn't get too form fitting in front when running into the wind like with other shorts. The cut is almost perfect slim fitting and flat in front. The only thing
I would change is have it a little flatter in the back but I defiantly don't feel like i'm wearing a skirt like with most other baggy split shorts. By far the best feature is the back pockets. I've been able to fit 6 gels in them although so far the most i've run with is 4 plus my car keys and they don't bounce around at all. I've washed these a number of times in the washing machine with the rest of my clothes and let them air dry no problem. Overall best shorts on the market. I plan on buying at least one more pair and never wearing anything else.
From: Michael, Bloomfield, MI, USA

Comments: I left the below review and want to post a quick follow up.  The day after writing that, I washed the shorts (cold), and tumble dried them on a low setting.  This was not kind to the liner I praised so much.  Having shrunk a bit, and having the textured roughened, it's now a chafing machine.  This would probably not be much of a problem if you have a short pelvic region, but it is for me.  In short, wash these by hand or on a very gentle washing machine setting with a mild detergent. Don't tumble dry them like I did.
From: Joel, Austin, TX, USA

Comments: I own a lot of shorts, including the direct predecessor to these.  It says a lot that having had these for just a couple of weeks I wear almost no other shorts day to day (don't worry, I hand wash after each wear).  So why are these the best split shorts known to mankind?  Let's start with the inside.  The liner, constructed of PI's minerale, is far wider, flatter, more contoured and thicker than the sort you've seen in your Nike, Brooks or Mizuno shorts.  What this means is that it essentially eliminates flopping around, secures you down comfortably, and prevents embarrassing scenes when you've just hopped under a water spray in a park to beat the heat at the end of that 20 miler.  The perforated "minerale" fabric liner wicks amazingly well, apparently does not accumulate odor, and appears to be actually engineered and thought out, rather than copied from the useless and marginally functional designs of competitors. 

The exterior? It's a work of art.  The split is perfect (an improvement from last year's rather embarrassing and very high one). The lay of the shorts is very flat against the legs, particularly in the front area, but without compromising mobility.  The competitor's shorts suddenly look hideously bloomy and floppy next to these sleek beauties, provided you have the trim and lithe body that a lot of running provides.  The waistband isn't the lazy spandex ridden bunched fabric catastrophe of yore. It lies flat, and does not pinch.
From: Joel, Austin, TX, USA