Picking between the Nathan VaporKrar vs Salomon Adv Skin 12 comes down to fit philosophy and pocket layout. The Salomon Adv Skin 12 wins for runners who want a glove-tight, locked-in feel with the industry-standard Sensifit cross-pull adjustment, while the Nathan VaporKrar 12L offers a slightly more forgiving wrap, generous front bottle wells, and a stretchier dump pocket for North American-style aid station resupply. If you're racing a technical mountain 50K to 100-miler in 2026 and want raw, no-bounce precision, the Salomon Adv Skin 12 is the safer bet; if you want comfort over 24+ hours with easier on-the-fly storage, the Nathan VaporKrar 12L pulls ahead.
Nathan VaporKrar vs Salomon Adv Skin 12: at-a-glance comparison
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Both vests sit in the premium 12-liter ultramarathon category, both have been refined across multiple generations, and both will get you through any mandatory-gear list in 2026. They differ in the details, and those details matter when you're 70 miles in with a heat rash forming under the sternum strap. Here's the spec sheet side by side.
| Feature | Nathan VaporKrar 12L (3.0) | Salomon Adv Skin 12 (Set) |
|---|---|---|
| Total capacity | 12 L | 12 L |
| Empty weight (M) | ~290 g | ~245 g |
| Front bottle wells | 2 (fits 600 ml or 20 oz) | 2 (fits 500 ml SoftFlasks, included) |
| Reservoir compatibility | Yes, dedicated insulated sleeve | Yes, dedicated sleeve |
| Adjustment system | VaporFit dual-side cinch | Sensifit cross-pull elastic cords |
| Front pockets | 6 (incl. 2 zippered, 2 stretch) | 5 (incl. 1 zippered phone) |
| Pole carry | Quiver-style rear loops | Quiver + front horizontal |
| Fabric | 3D AirMesh + power stretch | Sensifit 4-way stretch mesh |
| Best for | Long, hot, well-stocked aid stations | Technical alpine, self-supported |
| 2026 MSRP | $199 | $185 |
Fit and sizing: where the two vests diverge most
The biggest practical difference in the Nathan VaporKrar vs Salomon Adv Skin 12 debate is fit philosophy. Salomon's Sensifit system uses two horizontal elastic cords on each side of the chest that you can cross-pull simultaneously to dial in a near-custom wrap. Once set, it stays set, even when the vest is loaded with two 500 ml SoftFlasks, a phone, gels, and a wind shell. Runners with narrow torsos and lower body fat percentages tend to prefer this fit because it eliminates the rocking motion that loose vests develop on descents.
Nathan's VaporFit system uses two independent side-pull cords instead of the cross-pull design. It's easier to micro-adjust on the move (you can loosen one side after a big meal at an aid station without disturbing the other) but it requires a tighter initial dial-in to match Salomon's lockdown. Larger-chested runners and women with broader rib cages often find the VaporKrar more forgiving because it doesn't compress the diaphragm the way a slightly undersized Adv Skin can.
For sizing: Salomon runs notoriously small. If you're a US Men's Medium tee, you're probably a Large in the Adv Skin. Nathan runs closer to true-to-size, but go up one if you're between sizes and plan to wear a base layer plus mid-layer in cold mountain races.
Hydration system: SoftFlasks, reservoirs, and included accessories
Salomon ships the Adv Skin 12 Set with two 500 ml SoftFlask 42mm flasks already included. That's a real-money savings of about $40 and a major convenience: no hunting down compatible flasks. The flasks sit in deep front pockets with a magnetic bite valve retention loop that keeps the straw from flopping while you run. The flasks themselves use Salomon's collapsible design, which means they shrink as you drink: no sloshing, no constant rebalancing.
Nathan's VaporKrar 12L ships without bottles in some markets, though most US retailers bundle two 20 oz ExoShot 2.0 flasks. The pockets are slightly more vertical, which makes one-handed reinsertion easier on rough terrain (you don't have to angle the flask in). Nathan's bite valves use a twist-lock instead of magnetic retention. A small thing, but if you've ever had a magnetic loop pop off during a fall, you'll appreciate the twist-lock's reliability.
Both vests have dedicated reservoir sleeves rated for 1.5 to 2 liters. Both route the hose over the shoulder. Nathan's reservoir sleeve is insulated with a thin foam layer, a small detail that makes a real difference in summer races where bladder water heats up by mile 30. Salomon's sleeve is unlined but sits flatter against the back, which some runners prefer for hot-weather breathability.
Pocket layout and on-the-move access
The Adv Skin 12 has five front pockets: two flask pockets, two stretch mesh sleeves above them (perfect for gels or a folded buff), and one zippered security pocket sized for a modern phone. Behind, you get a kangaroo dump pocket, a zippered valuables pocket, and the reservoir sleeve. The phone pocket sits high on the right chest, which puts it about an inch closer to your face during selfies but adds a hint of asymmetric weight.
The VaporKrar 12L counters with six front pockets: two flask pockets, two stretch sleeves, and two zippered pockets (one for valuables, one rear-of-flask for ID or credit card). Behind, you get a much larger stretch dump pocket, genuinely the biggest in the category, plus a side-access pocket on the right that lets you stuff trash or a snack bar without removing the vest. This last detail is what tips many North American ultrarunners toward Nathan: at well-stocked aid stations, you can grab three gels and a pickle and stash them in three seconds.
Pole carry: which vest carries your trekking poles better?
Both vests accept folding Z-style trekking poles in 110-130 cm lengths. Salomon's quiver uses a single bungee loop at the lower back combined with a tab and elastic at the top of the rear panel. It works, but threading poles back in solo while moving is awkward. Salomon also offers a separate front horizontal carry that runs across the chest, which is faster to deploy but adds visible bulk in front.
Nathan's VaporKrar 12L uses a dual-elastic quiver on the right rear panel with a bottom slot and top retention bungee. It's slightly easier to stow and retrieve solo, especially with one hand, and it doesn't bounce as much when running technical downhill. If you're doing a race with extended runnable downhill where you'll stow and re-deploy poles repeatedly, the VaporKrar's pole system is the better designed of the two.
That said, the vest only matters if your poles are also dialed in. We have a full breakdown over at our trekking poles for ultramarathons guide worth reading before race day.
Nordic Lightweight 7075 Aluminum Trekking Poles
If you're running a mountain ultra and don't want to spend $200 on carbon Z-poles, the Nordic Lightweight 7075 Aluminum set is the best budget pick to pair with either vest. 7075 aluminum is the aerospace-grade alloy used in high-end poles: stronger than the 6061 found in cheap poles and far less prone to bending when you plant hard on a steep climb. They collapse short enough to fit either the Nathan VaporKrar's or the Salomon Adv Skin 12's quiver and the included tungsten carbide tips bite reliably on wet granite. Check the Nordic 7075 poles on Amazon.
TREKOLOGY Trek-Z Cork Grip Folding Trekking Poles
For runners who want the convenience of folding Z-poles (faster deployment, smaller pack-down length) without the carbon-fiber price tag, the TREKOLOGY Trek-Z is the go-to in 2026. The cork grips wick sweat better than EVA foam on hot races, the trifold design compresses to about 15 inches for easy stowing in your vest's quiver, and the included rubber tips, snow baskets, and mud baskets cover every race condition. They pair especially well with the Salomon Adv Skin 12's horizontal front carry because of their compact stowed length. See the TREKOLOGY Trek-Z on Amazon.
Collapsible Aluminum Trekking Poles, 2-Pack
If you're crewing for a runner or training partners share a vest setup, a 2-pack of collapsible aluminum poles is hard to beat for value. The telescoping (not folding) design makes them slightly longer when stowed than Z-poles, but they're rugged, repairable in the field with a hex key, and adjust across a wider length range, useful when multiple runners of different heights share them. View the 2-pack on Amazon.
Durability and long-term reliability
Both vests survive multiple ultramarathon seasons if cared for. The Salomon Adv Skin 12's main wear point is the elastic cross-pull cords: after about 1,000 miles, the elastic loses some of its initial snap, and you'll notice a slight loosening on hard descents. Replacement cords are a $10 fix you can do at home. The Adv Skin's main fabric is bombproof; it's the same Sensifit mesh used in Salomon's flagship S/Lab line.
The Nathan VaporKrar 12L's main wear point is the front zipper pockets, which can develop YKK slider issues after heavy use in salty, sweaty conditions. Nathan honors a generous warranty, but a quick rinse after every long run prevents 90% of zipper failures. The main fabric is slightly heavier than Salomon's, which translates to a few extra grams but noticeably better abrasion resistance against brush and rock scrambles.
Which one should you buy in 2026?
Buy the Salomon Adv Skin 12 Set if you're a European-style mountain ultrarunner racing UTMB, Hardrock, OCC, or any race with significant vert and limited aid. The locked-in fit, included SoftFlasks, and lighter weight make it the technical-mountain choice. Pair it with a folding Z-pole for stowing in the rear quiver.
Buy the Nathan VaporKrar 12L if you're racing North American ultras with well-stocked aid stations every 5-10 miles, think Western States, Leadville, or JFK 50, and want maximum on-the-fly storage, easier sizing for broader torsos, and an insulated reservoir for hot summer races. The bigger dump pocket alone is worth the price difference for runners who treat aid stations like buffets.
For a deeper look at race-day gear decisions, see our 2026 ultramarathon gear checklist and the broader best hydration vests of 2026 roundup.
Frequently Asked Questions
Is the Nathan VaporKrar or Salomon Adv Skin 12 better for women runners?
Salomon makes a women's-specific Adv Skin 12 with a shorter torso length, narrower shoulder straps, and a sternum strap routing that avoids the bust line entirely. Nathan does not currently offer a women's-cut VaporKrar 12L, though the unisex model fits many women well thanks to the more forgiving VaporFit adjustment. For women under 5'4" or with a longer torso, the women's Salomon Adv Skin 12 is the better fit.
Can the Salomon Adv Skin 12 fit a 2-liter bladder?
Yes, the Salomon Adv Skin 12 reservoir sleeve accommodates bladders up to 2 liters, though Salomon's own bladder is rated at 1.5L. Most third-party 2L bladders (Camelbak, Osprey, HydraPak) fit, but you'll need to remove one or both front SoftFlasks to balance the load if you fill the bladder completely. Total carry capacity becomes 12L of gear plus 2L of water, about 4.5 pounds at the start.
Does the Nathan VaporKrar 12L bounce on technical descents?
Only if you under-cinch the VaporFit cords. With the side cords dialed tight enough, the VaporKrar locks in nearly as well as the Salomon Adv Skin 12, but the adjustment window is narrower: loosen the cords just a centimeter too far and the vest will start to rock on steep technical descents. Most VaporKrar bounce complaints come from runners who set the fit at rest and don't re-tighten after the vest stretches under load.
Which vest is better for hot-weather ultramarathons?
The Nathan VaporKrar 12L wins narrowly for heat. Its insulated reservoir sleeve keeps your bladder water 5-10°F cooler over a 12-hour race, and the 3D AirMesh main fabric breathes slightly better against bare skin than Salomon's Sensifit mesh. That said, the Salomon Adv Skin 12 is lighter, which can offset breathability in extreme heat by reducing overall body load. For races above 90°F, lean Nathan.
Are trekking poles required for ultramarathons?
Trekking poles aren't required for most ultras, but they're transformative for any race with significant vert, anything above about 5,000 feet of climbing per 50K. Both vests carry poles well, though the Nathan VaporKrar 12L has the more user-friendly solo-deploy quiver. For a pole strong enough to support your full body weight on a steep grind, look for 7075 aluminum or carbon construction.
What size SoftFlask fits the Nathan VaporKrar 12L?
The Nathan VaporKrar 12L front pockets fit 500 ml to 600 ml flasks, including Nathan's 20 oz ExoShot 2.0 and Salomon's 500 ml SoftFlask 42mm. Avoid 750 ml flasks: they'll fit but stick out so far they catch on arm swing. Most ultrarunners pair the VaporKrar with two 20 oz Nathan ExoShots plus a 1.5L bladder for a total carry of 2.6L of water.
How does the Salomon Adv Skin 12 compare to the Salomon Adv Skin 5?
The Adv Skin 5 is the 5-liter version: same fit system, same fabric, same SoftFlasks, but with reduced rear storage. The 5L is ideal for marathons, 50Ks with full aid coverage, and training runs. The Adv Skin 12 is for runs that require carrying mandatory gear: emergency blanket, headlamp, rain shell, extra layers. If you're trying to choose between the two, ask what your longest planned race requires. If you'll ever need to carry a rain jacket and headlamp simultaneously, get the 12.
Key Takeaways
- Choosing the right Nathan VaporKrar vs Salomon Adv Skin 12 means matching capacity and output ports to your actual devices
- Always check actual watt-hours (Wh), not just watts — runtime depends on Wh, not peak output
- Also covers: 100 mile race vest comparison
- Also covers: best vest for 50 miler ultramarathon
- Also covers: Salomon vs Nathan ultra running pack
- Compare price-per-Wh across models to find the best value for your budget