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On the Trail to Excellence: Unveiling the On Ultra Series

When most of think about On in the running sphere, our minds likely go to their unique (and frankly beautiful) footwear. On has made, to this reviewer at least, a resurgence in their running line and have recently produced some solid running shoes along the way (I still love the Cloudmonster). But On also has apparel made for a runner as well, and we have been obsessed lately.

Read all our posts about On here!
Ultra-T

In the realm of running tops, the prevailing sentiment often leans towards lighter and airier options. While this holds true for many, the On Ultra-T challenges the status quo, recognizing that sometimes, a bit more structure is just what you need during those extended trail sessions.

Upon donning the Ultra-T for the first time, it becomes evident that this top doesn’t conform to the ‘barely there’ trend dominating the running apparel market. It’s not the lightest in my wardrobe but it brings a welcomed sense of durability and structure to the table. In a running world that often celebrates minimalism, the Ultra-T stands out as a reliable companion, seemingly built for the long haul.

Sporting a semi-fitted design, the Ultra-T seems to blur the line a little between a traditional top and a baselayer. This versatility allows it to seamlessly transition from standalone wear to being comfortably layered under a light jacket or vest. Its adaptive nature feels like a strategic response to the unpredictable challenges that trails can present, making it a go-to choice for runners seeking flexibility in the PNW.

The absence of seams adds to the Ultra-T’s comfort factor, ensuring a chafe-free experience even during extended runs. Furthermore, the inclusion of a convenient back pocket adds a practical touch, providing a secure spot for small essentials.

Ultra Shorts

Tailored to meet the specific demands of trail runners, the On Ultra Shorts seamlessly combine functionality and style, prioritizing performance over mere aesthetics. With color options like classic black or the unique grape-black (reviewed) variant, the shorts offer a straightforward yet effective design. However, in the realm of endurance trail running, where hours on the trails become a norm, looks become the least of one’s concerns.

The shorts boast a DWR treatment on the fabric, ensuring resilience against the unpredictable elements of trail running and providing a dry and comfortable experience even in damp conditions. The four-way stretch material enhances the shorts’ adaptability, accommodating the constant movement and need for non-limiting motions that define trail running.

Despite the initial appearance, these shorts feature an impressive array of integrated storage pockets – six in total. Four are located at the front, one at the side seam, and a zippered one at the back, which also features pass-through capability. This thoughtful design allows for convenient storage of essentials like sleeves or a lightweight jacket.

In testing the load capacity of the pockets, the On Ultra Shorts proved themselves up to the challenge. While a desire for slightly larger and stronger front pockets for a phone was noted, the back pocket offered a secure alternative. The drawcord, seemingly delicate at first glance, surprisingly holds up well, requiring less adjustment even under heavy packing conditions.

Weighing in at around 4.5 to 5 ounces, depending on the size, the shorts boast a lightweight and breathable design. The adjustable waistband ensures a personalized fit, making them an ideal choice for both seasoned and aspiring trail runners. Despite a shorter fit on the thighs, the shorts strike a harmonious balance between security and navigability, challenging preconceptions about trail-ready apparel.


I am not an ultra-runner, but one day I aspire to be (maybe once the kids leave the house). I may not need all the bells and whistles that ultra runners like our blogger Drew does. However, it is nice to have options like these available!

On Ultra Apparel

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About Author

Matt Rasmussen lives in Keizer, Ore. with his wife and three daughters. He enjoys watching hockey, going to as many breweries (703) and wineries (239) as he can, and all things Canada (he was born there). Matt was raised as a baseball player and officially transitioned over to running in 2010.

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