Snowmobiling in Colorado means riding at serious altitude, often between 10,000 and 12,500 feet. Temperatures up there can drop well below zero with wind chill, even on sunny days. What you wear under your riding gear makes the difference between a comfortable ride and a miserable one. Here's the breakdown.
The Layering System Explained
One heavy coat won't cut it at altitude. The three-layer system works better because it traps warm air between layers while letting moisture escape from your body. When you're riding, your core generates heat from gripping the handlebars and leaning into turns. Proper layers manage that heat so you stay warm without getting sweaty.
The concept is simple:
- Base layer: Wicks moisture away from your skin
- Mid-layer: Insulates and traps warm air
- Outer layer: Blocks wind and snow (usually provided by tour operators)
Base Layer (Most Critical)
Your base layer sits directly against your skin and has one primary job: move sweat away from your body. When moisture sits on your skin at altitude, it cools rapidly and makes you cold fast.
Best choices:
- Synthetic fabrics (polyester, nylon blends) - dry quickly, affordable, easy to find at any sporting goods store
- Merino wool - naturally antimicrobial, excellent warmth-to-weight ratio, slightly more expensive but worth it
You need both a base layer top (long-sleeve) and base layer bottoms (long underwear or athletic tights). Don't skip the bottoms, your legs are exposed to wind the entire ride.
Socks matter enormously. Wear one pair of medium-weight wool or synthetic socks. Not cotton. Not two pairs (double-layering causes friction blisters). Wool socks stay warm even when damp and provide cushioning in the riding boots.
The golden rule: never wear cotton as a base layer. Cotton absorbs sweat, holds it against your skin, and takes forever to dry. A cotton t-shirt under a snowsuit will leave you shivering within 30 minutes.
Mid Layer
Your mid-layer provides insulation by trapping dead air between your base layer and outer shell. The more air it traps, the warmer you stay.
- Fleece jacket or pullover: The go-to choice. Lightweight, warm, and dries quickly if it gets damp. A 200-weight fleece works for most Colorado conditions.
- Lightweight down vest: Optional addition for extremely cold days (below 10F). Provides core warmth without restricting arm movement.
- Fleece pants: For cold-sensitive riders or deep winter riding, fleece pants between your base layer bottoms and the snowsuit add significant warmth.
Avoid heavy ski jackets or puffy down coats as mid-layers. They're too bulky to fit comfortably under a snowsuit and restrict your movement on the machine.
Outer Layer
Here's the good news for most riders: guided tour operators provide the outer layer. A standard gear package includes:
- Insulated snowsuit (one-piece or two-piece bibs + jacket)
- Insulated snow boots
- Waterproof riding gloves
- DOT-approved helmet with visor
- Goggles
If you're renting a snowmobile for self-guided riding and need to bring your own outer layer, look for a waterproof and windproof shell jacket paired with snow bibs. Ski pants and a shell jacket work in a pinch. The key features are wind blocking and water resistance.
Head, Hands, and Feet
Exposed extremities are where most riders lose heat first. Pay attention to these:
- Thin beanie or skull cap: Fits under the helmet and covers your ears. Thick beanies won't fit well inside a helmet, so go thin.
- Neck gaiter or balaclava: Covers your neck, chin, and lower face. Essential on cold or windy days. Pull it up over your nose when riding into wind.
- Glove liners: Thin synthetic liners inside the provided riding gloves add surprising warmth. Useful on days below 15F.
- Hand/toe warmers: Chemical heat packs ($1-$3 per pair) are cheap insurance against cold extremities. Toss them inside your gloves or boots before heading out.
What Tours Typically Provide
Most guided tour operators in Colorado provide a full gear package at no extra charge. That package normally includes the snowsuit, boots, gloves, helmet, and goggles. Some operators also offer balaclava or neck gaiters on request.
This means your main responsibility is showing up with good base layers, a mid-layer, wool socks, and a thin beanie. For a full packing list, see our gear checklist.
What NOT to Wear
These clothing choices cause problems on snowmobile tours, and we see them every week:
- Cotton anything: Cotton t-shirts, cotton socks, cotton hoodies. Gets wet from sweat, stays wet, gets cold. This is the most common mistake.
- Jeans: Heavy cotton that absorbs moisture and provides zero insulation. Jeans under a snowsuit will leave your legs cold within 20 minutes.
- Loose scarves: Dangling fabric can catch in moving parts or blow into your visor. Use a fitted neck gaiter instead.
- Bulky winter coats: Too thick to fit properly under a snowsuit. You'll feel restricted and uncomfortable.
- Fashion boots: Leather boots, Uggs, or fashion snow boots don't provide enough insulation or ankle support. Wear the provided riding boots.
Colorado-Specific Tips
Riding at altitude in Colorado creates conditions you won't find at lower-elevation snowmobile destinations. A few things to keep in mind:
- UV protection is critical. At 10,000+ feet, UV radiation is about 40% stronger than at sea level. Apply SPF 30+ sunscreen to any exposed skin and use SPF lip balm. Sunburn happens fast at altitude, even on cloudy days.
- Wind chill amplifies cold. A 20F day at 10,000 feet with a 20 mph wind creates a wind chill near -10F. Your base layers and face protection need to account for this.
- Weather changes fast. A sunny morning can become a snow squall within 30 minutes. Carry an extra neck gaiter in your pocket in case conditions shift mid-ride.
- Dry air dehydrates. Colorado's mountain air is extremely dry. Drink water before and after your ride. Dehydration amplifies altitude sickness symptoms.
Need more detail on gear and what to bring? Our beginner snowmobiling guide covers the full first-timer experience. Ready to book? Check today's available tours.
For more on layering systems for outdoor winter activities, REI's layering guide covers the fundamentals in detail.