Your checklist for Sansilbestrail
What you need, category by category, with our #1 pick for this race. Tick what you already have.
0 of 6 ready
Swipe to see all 7 categories
Swipe to see all 7 categories
GPS watch
Done, you already have it
View on Amazon →(opens in a new tab)Garmin Instinct 3 AMOLED 45 mm
Onboard topo maps, unlike the Instinct 3 Solar
Downside: Shorter battery life than the Instinct 3 Solar (no solar charging or MIP display)
Gear
Shoes with aggressive lugs for mud and leaf litter
Done, you already have it
View on Amazon →(opens in a new tab)Nike Ultrafly
ZoomX foam: exceptional energy return inherited from the Vaporfly
Downside: High price (190 EUR)
Nutrition
One gel or bar every 40-45 minutes in the 20K
Done, you already have it
View on Amazon →(opens in a new tab)Maurten Gel 100
Hydrogel technology: excellent gastric tolerance
Downside: High price compared to other gels
Sun Protection
Sweat-resistant SPF50 cream, reapply at aid stations
Done, you already have it
View on Amazon →(opens in a new tab)ISDIN Fusion Water Sunscreen SPF 50+
Ultralight texture, feels invisible on skin
Downside: Small format (50 ml), may run short on ultras
Body Care
Anti-chafe balm on armpits, thighs and feet
Done, you already have it
View on Amazon →(opens in a new tab)Julbo Aerospeed
Photochromic lenses: adapt from forest to summits
Downside: Higher price compared to non-photochromic glasses
Car Rental
Book in advance and check the mileage policy
Done, you already have it
View on Amazon →(opens in a new tab)DRIVALIA CarCloud Country Plus
Trip logistics
Registration, travel and insurance: what you should have sorted before race day.
Affiliate links: if you buy, we earn a commission at no extra cost to you.
Seasonal kit
Cold weather at Sansilbestrail: pack the winter kit
Layers, gloves, neck gaiter and footwear for running in the cold, with short-race and ultra versions.
See the full kit : What to Wear for Cold-Weather Trail Running 2026: The Complete Layering KitRace data
Terrain
Mountain
Difficulty
Intermediate
Distance
2 modalities
20K
- Distance
- 20 km
- Elevation Gain
- ≈D+ 1000m
- Max Time
- -
8K
- Distance
- 8 km
- Elevation Gain
- ≈D+ 300m
- Max Time
- -
| Modality | Distance | Elevation Gain | Max Time |
|---|---|---|---|
| 20K | 20 km | ≈D+ 1000m | - |
| 8K | 8 km | ≈D+ 300m | - |
Will your watch battery last the ~5 h of Sansilbestrail?Worked out for the longest course (20 km). See which watches reach the finish with GPS on and which die on the way.Check my watch Check my watchGet ready for Sansilbestrail with the 8-week plan
7 weeks to go: start the plan today to reach Sansilbestrail feeling good.
Week-by-week table with hill work, descents, strength and a taper, plus the right gear at each stage.
See the week-by-week plan7 weeks to Sansilbestrail: get your kit ready
Buying guides with the best value for money, picked for this kind of terrain.
Swipe to see all 4 comparisons
Best Neck Gaiter (Buff) for Trail Running 2026: Comparison & Buying Guide
See comparison
Best Trail Running Headlamps 2026: 12 Models Compared
See comparison
Best GPS Watches with Offline Maps 2026: Value Comparison
See comparison
Best Trail Running Poles 2026: Comparison and Buying Guide
See comparison
Historical weather
What to wear at 5 °C: guide and kit →
Typical weather for the race date (10-year average)
Temperature
4°C – 10°C
Average 7°C
Rain
27%
1.2 mm avg
Wind
19 km/h
max. average
Sunshine hours
6h
daily average
Gear recommendations
Bring thermal layers (low of 4°C)
Buff
Buff Thermonet
Thermal tubular Buff with Primaloft technology. Traps body heat, ultralight and versatile: hat, neck gaiter, headband. Ideal for high mountain.
Craft
Craft Pro Hypervent LS Wind Top
Thermal top with a windproof ripstop panel on the chest and a highly ventilated soft jersey back. Built for high-intensity sessions in cold, windy conditions, with long cuffs and thumb loops.
HANKER
HANKER Thermal Neck Gaiter
Unisex thermal seamless neck gaiter in Soft Air Plus fabric (97% polyester). Seamless fit designed for trail running, cycling, motorcycling and outdoor sports. A budget alternative to Buff for moderate cold.
Icebreaker
Icebreaker Merino 200 Oasis LS Crewe
Long-sleeve thermal top in 100% merino wool (200g). Natural temperature regulation, genuine multi-day odor resistance and a soft, non-itch handfeel from the fine merino yarn.
Odlo
Odlo Active Warm Eco
Long-sleeve thermal base layer made from recycled fabric with anti-odour treatment. Active thermal regulation, ideal as a base layer in the mountains.
Odlo
Odlo I-Thermic Women's Longsleeve
Women's long-sleeve thermal top with insulating panels placed over cold-sensitive areas (lower back and kidneys). A mid-layer built for genuinely cold winter conditions, mountain outings or cross-country-style trail sessions.
ROCKBROS
ROCKBROS Thermal Windproof Balaclava
Thermal windproof balaclava covering head, ears, cheeks and neck. Designed for cycling and motorcycling, it works just as well on windy, freezing trail runs.
Salomon
Salomon Agile LS Tee
Lightweight quick-dry polyester long-sleeve tee with underarm mesh, a side pocket and reflective details. Works as a standalone layer in mild cold or as a base layer under a windbreaker on colder days.
Salomon
Salomon Cross Run Tight
Long trail tights with stretchy, breathable fabric. Adjustable waist, zipped back pocket. Protection from cold and vegetation.
Salomon
Salomon Cross Warm Glove
Thermal running gloves with a non-slip palm and touchscreen fingertips. Light, warm and compatible with poles.
Under Armour
Under Armour ColdGear Armour Compression Mock
Compression thermal top with a dual-layer fabric: ultra-warm brushed interior and quick-dry exterior. Second-skin compression fit with stretch mesh panels at the back and underarms for ventilation without losing warmth.
Under Armour
Under Armour ColdGear Armour Compression Mock (Men's)
Men's high-neck thermal compression top: brushed interior that holds heat and a quick-dry outer. Base layer for cold-weather runs.
Bring thermal gloves (low of 4°C)
Gore Wear
Gore Wear C5 GORE-TEX Glove
Glove with a fully waterproof, windproof GORE-TEX membrane and light insulation. The pick for running in snow, sleet or heavy rain while keeping your hand dry.
Gore Wear
Gore Wear M GORE-TEX Thermo Glove
Warmer variant of the Gore Wear C5 GORE-TEX: the same fully waterproof, windproof membrane, with extra thermal lining for intense cold on top of snow or rain. The pick when the problem isn't just water, but water AND hard cold at once.
Icebreaker
Icebreaker Oasis Liners
Thin merino wool glove, lightweight and breathable, with good moisture management and none of the overheating of a thick technical glove. Ideal as a liner layer or for mild winter temperatures.
LEKI
LEKI Ultra Trail Storm Shark
Glove for pole runners with the Shark system: clips straight into the grip of compatible LEKI poles, transferring force without closing your hand. Windproof and water-repellent.
Ronhill
Ronhill GORE-TEX Windstopper Glove
Running glove with GORE-TEX Windstopper fabric: blocks wind and repels light rain without the bulk of an insulated glove. Thin, close-fitting and dexterous.
Salomon
Salomon Bonatti Pro Waterproof Glove
Lightweight waterproof glove built for running, not just standing still in the snow: a waterproof membrane with more dexterity and less bulk than a thick membrane glove, for sustained rain without giving up handling gels or poles.
Salomon
Salomon Cross Warm Glove
Thermal running gloves with a non-slip palm and touchscreen fingertips. Light, warm and compatible with poles.
Salomon
Salomon Fast Wing Winter Glove
Technical winter trail running glove with a windproof outer shell and warm lining. Built for long outings in intense cold, wind and some moisture in the mountains.
Sealskinz
Sealskinz Waterproof Lightweight Glove
Lightweight waterproof glove from a brand that specializes in outdoor sport waterproofing. A solid middle ground between a thin windproof glove and a thick membrane glove: genuinely waterproof without the bulk or price of the Gore C5.
Consider long tights for nighttime cold
Amazon Essentials
Amazon Essentials Active Sculpt Plus-Size Leggings
High-waisted leggings with Active Sculpt compression fabric, available in plus sizes. Wide waistband that doesn't roll down or over-compress during long mountain outings.
HANKER
HANKER Women's Cropped Compression Leggings with Pockets
Compression capri tights with high waist and phone pockets. Quick-drying, suitable for running and trail.
Izas
Izas Olimpia Women's Long Tights
Women's long leggings with a shaping, push-up compression effect, stretch breathable fabric and reflective details. Originally designed for gym and yoga, but the compression and reflective details also make it usable for low-light running.
Joma
Joma Academy Knight Men's Thermal Tights
Men's thermal pants with a brushed inner lining, built for training and running in cold weather. Elastic drawstring waist and heat-retaining fabric for winter outings or cold early mornings.
Joma
Joma Vela II Women's Shorts
Lightweight, stretch women's running shorts with a wide size range (4XS to 2XL). Breathable fabric built for training and running in summer without overheating.
Salomon
Salomon Comet Warm Tight W
Salomon women's thermal long tights for training and racing in the cold. A warm layer for autumn and winter.
Salomon
Salomon Cross Run Tight
Long trail tights with stretchy, breathable fabric. Adjustable waist, zipped back pocket. Protection from cold and vegetation.
Forecast for 19 December
Weather forecast from Open-Meteo (may change until race day)
Sansilbestrail: the end-of-year trail in Zubiri
The Sansilbestrail closes the Navarrese season with a mountain race in Zubiri, in the Esteribar Valley. It is run by the same team as the Nafarroa Xtrem, so the marking and runner care come from a well-rehearsed event. The 2026 edition is announced for 19 December.
Two routes
- 20K: about 20 kilometres with around 1,000 m of elevation gain, passing over the summit of Baratxueta.
- 8K: a short route of about 300 m D+ on the lower part of the mountain, ideal for a first trail or a family outing.
These figures come from the 2025 edition; the 2026 regulations have not been published yet.
What to expect in December
A winter race: wet ground, mud, leaves and cold on higher sections. Shoes with good lugs and a windproof layer make a real difference. With few daylight hours, check the start time to decide whether you need a headlamp.
How to prepare
For the 20K, train sustained climbs and technical descents on wet terrain. Combine it with other nearby events in our regional race listing and plan your calendar with the race planner.
360Complete Pack
Sansilbestrail 2026 registration
RegistrationRegistration opens on 11 November 2026 at 11:00. Check the official website for the entry link.
Tips
- •Set a reminder for 11/11 at 11:00: spots in Zubiri races go quickly
- •A federation licence or valid medical certificate is required
Where to stay for SBT
AccommodationBook accommodation near the start in advance: the race weekend fills the area.
Tips
- •Look for accommodation within 30 min of the start
- •Book months ahead if the race falls on a holiday weekend or in summer
Gear for the Sansilbestrail
GearDecember in the Navarrese Pyrenees: cold, mud and possible snow on higher ground.
Tips
- •Shoes with aggressive lugs for mud and leaf litter
- •Windproof layer and gloves: it feels much colder on the ridges
- •Spare headlamp if you start in the later waves
Which shoes for Sansilbestrail?
Which footwear fits based on the race's terrain and weather
Which GPS watch for Sansilbestrail?
Which watch has the battery to last based on your estimated finish time
Best Neck Gaiter (Buff) for Trail Running 2026: Comparison & Buying Guide
Comparison of the best neck gaiters for trail running in 2026: Buff Original, Midweight, Windproof, DryFlx, CoolNet UV+, Thermonet, HANKER and Salomon Merino. Which to pick based on sun, wind, cold or budget.
Best Thermal Base Layer for Trail Running 2026: Comparison & Buying Guide
The best thermal base layers for trail running in 2026: Odlo Active Warm Eco, Icebreaker Merino 200 Oasis, Craft Pro Hypervent, Under Armour ColdGear, Salomon Agile LS Tee and Odlo I-Thermic. Which to pick based on cold, sweat management, merino wool, compression or built-in wind protection.
Best Trail Running Gaiters 2026: 3-Way Comparison
Comparing the 3 best trail running gaiters in 2026: Salomon Trail Gaiters High, Salomon Trail Gaiters Low and TRIWONDER waterproof gaiters. Which to pick by terrain and budget.
Nutrition for the Sansilbestrail
Nutrition20 km with 1,000 m D+ in the cold: eat before you get hungry.
Tips
- •One gel or bar every 40-45 minutes in the 20K
- •Carry a warm drink in your vest for the cold
Getting to Zubiri
TransportZubiri is in the Esteribar Valley, about 25 km from Pamplona on the N-135.
Tips
- •Pamplona airport is about 30 km away
- •Park in the areas indicated by the organisers
Car rental for SBT
Car RentalA car makes it easier to reach the start and get around before and after the race.
Tips
- •Book in advance and check the mileage policy
- •Useful if your accommodation is far from the start
Sports insurance for SBT
InsuranceCover your participation with insurance that includes medical assistance and mountain rescue.
Tips
- •Check that it covers the race format and elevation gain
- •Review rescue cover if the race is in the mountains
Sun protection for SBT
Sun ProtectionSun exposure takes its toll on long races, especially on exposed sections and at midday.
Tips
- •Sweat-resistant SPF50 cream, reapply at aid stations
- •Protect lips, ears and neck
Body care for SBT
Body CareKilometres and descents punish feet and skin: anti-chafe balm and blister patches prevent DNFs.
Tips
- •Anti-chafe balm on armpits, thighs and feet
- •Blister patches in your pocket
Frequently Asked Questions
- When is the Sansilbestrail 2026?
- The organisers have announced Saturday 19 December 2026, starting and finishing in Zubiri (Navarre).
- What distances are there?
- Two routes: 20 km with about 1,000 m of elevation gain and 8 km with about 300 m, based on the 2025 edition.
- When does registration open?
- On 11 November 2026 at 11:00, according to the organisers' announcement.
- Who organises it?
- The Nafarroa Xtrem team (Nafarroa Xtrem GR322 Mendi Taldea), who also run the GR 322 Nafarroa Xtrem in April.
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