#5 on this list
Zero
On
The On Zero jacket is designed around a singular design objective: shedding every superfluous gram to deliver the ultimate featherweight running layer. Earning top ultralight honors from reviewers, this shell is barely perceptible when worn. It is targeted at competitive runners and minimalist racers who want pure wind protection without feeling like they are wearing an extra layer. The Zero utilizes a gossamer-thin, windproof fabric engineered to cut wind chill during fast workouts. On tailored the fit to be sharp and aerodynamic, ensuring minimal fabric rustle or flapping at high speeds. When the sun breaks through, the shell folds down into an exceptionally small bundle that slides effortlessly into a shorts waistband or hand pocket. Naturally, cutting weight to this degree comes with structural compromises. The ultra-fine material requires cautious handling to prevent tears against tree branches or thorny trailside brush. Breathability is also limited compared to softshells, and the jacket provides negligible defense against rain beyond a brief mist. At an approximate price of $160, you are paying a premium for pure weight reduction. **Highlights** - Incredibly low weight and micro-packable volume - Sleek, aerodynamic cut tailored specifically for fast running - Highly effective wind blocking along the chest and arms - Clean, modern aesthetic with reflective details for low-light visibility - Subtle elastication at cuffs and hem to seal out drafts **Watch-outs** - Fragile, ultra-thin fabric requires careful handling - High price point given the minimalist feature set
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#6 on this list
Direction Ultra
Ultimate
The Ultimate Direction Ultra is built specifically for runners who must navigate torrential weather in serious environments. Frequently cited as a top-tier waterproof running layer, it meets the strict gear criteria enforced by major mountain ultramarathons. If your training routes take you miles away from civilization where catching a chill from wet conditions is a safety hazard, this shell provides legitimate armor. Crafted from 100% nylon with a fully taped interior, the Ultra jacket achieves an impressive balance between true waterproofing and packable weight, clocking in at an official 6.56 ounces. Reviewers consistently highlight thoughtful running details, such as the integrated flip-out mitts built into the sleeves to protect cold hands, and underarm vents designed to circulate air without letting precipitation penetrate. As with any fully taped rain shell, interior moisture management remains a consideration. While it breathes well for a waterproof jacket, intense uphill running in humid rain will eventually push the membrane past its vapor capacity. The material also exhibits a crisper, louder texture than softshells, but it delivers absolute weather integrity when conditions deteriorate. **Highlights** - Fully waterproof and seam-taped 100% nylon construction - Published weight of 6.56 ounces meets strict ultramarathon gear checks - Integrated Flip Mitts built into the cuffs for instant hand warmth - Underarm vents provide continuous airflow without compromising storm defense - Ergonomically fitted hood with a brim that channels rain away from the face **Watch-outs** - Fabric is crinklier and noisier than untaped wind jackets - Can build up internal condensation during steep, sustained ascents
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Specs side by side
| Spec | Zero | Direction Ultra |
|---|---|---|
| Jacket Type | Ultralight wind shell | — |
| Approximate Price | $160 | — |
| Primary Material | Lightweight polyamide ripstop | — |
| Packability | Pocketsize micro-packable bundle | — |
| Weather Shield | Windproof with light mist repellency | — |
| Fit Profile | Athletic, streamlined cut | — |
| Fabric | — | 100% nylon |
| Weight | — | 6.56 oz (approx. 186 g) |
| Seam Construction | — | Fully taped seams |
| Ventilation | — | Integrated underarm vents |
| Cuff Design | — | Ergonomic with built-in Flip Mitts |
| Weatherproofing | — | Fully waterproof running shell |
What our reviewers liked and didn't
Zero
- Barely perceptible weight on the body during fast efforts
- Packs down to micro dimensions for effortless stowing
- Cuts biting wind immediately to preserve core warmth
- Sleek athletic cut eliminates fabric flapping at speed
- Ultra-thin material is susceptible to snags and tears
- High retail price for a single-purpose wind layer
- Offers minimal protection in sustained rainfall
Direction Ultra
- Meets strict ultramarathon mandatory gear requirements for waterproofness
- Integrated Flip Mitts provide instant emergency warmth for cold hands
- Low 6.56-ounce carry weight packs down tightly into a running vest
- Underarm vents supply passive airflow without admitting sideways precipitation
- Internal moisture builds up during high-intensity, sustained uphill climbing
- Crisp nylon shell produces noticeable crinkling noise during arm swings
- Thin exterior textile demands caution around dense, thorny brush
Prices change constantly — the figure shown is the last verified catalog price, and the buy buttons always go to the current listing.