Temperature Rating
Temperature Rating
Understanding temperature ratings helps you select the right THREE HILL gear for your conditions and activity level. Our ratings account for insulation, breathability, and layering systems.
How Temperature Ratings Work
Key Factors
Temperature comfort depends on multiple variables:
- Activity Level: High-output activities generate body heat
- Metabolism: Individual heat generation varies
- Layering: Base and mid layers significantly impact warmth
- Wind: Wind chill dramatically affects perceived temperature
- Humidity: Moisture impacts insulation effectiveness
- Acclimatization: Adaptation to climate affects comfort
Rating System
Our temperature ratings indicate the lowest comfortable temperature for moderate activity with appropriate base layers. Ratings are guidelines, not guarantees—individual comfort varies.
AIRSPEED Series
Performance Range
Temperature Range: 40°F to 65°F (4°C to 18°C)
Best For: Cool to mild conditions with wind or light precipitation
Construction
- Lightweight shell fabric
- No insulation (layering system)
- DWR water-resistant coating
- Windproof construction
- Maximum breathability
Layering Recommendations
40-50°F: Base layer + mid layer (fleece or light insulation) + AIRSPEED shell
50-65°F: Base layer + AIRSPEED shell
Above 65°F: AIRSPEED shell alone for wind/rain protection
Activity Guidelines
High Output: Comfortable to 35°F with proper layering
Moderate Activity: Comfortable to 40°F with proper layering
Low Activity: Comfortable to 50°F with proper layering
APOGEE Series
Performance Range
Temperature Range: 20°F to 45°F (-7°C to 7°C)
Best For: Cold conditions with variable activity levels
Construction
- Synthetic insulation fill
- Weather-resistant outer fabric
- DWR coating
- Balanced warmth-to-weight ratio
- Breathable construction
Layering Recommendations
20-30°F: Base layer + mid layer + APOGEE insulated layer
30-40°F: Base layer + APOGEE insulated layer
40-45°F: APOGEE alone or with light base layer
Activity Guidelines
High Output: Comfortable to 15°F with proper layering
Moderate Activity: Comfortable to 20°F with proper layering
Low Activity: Comfortable to 30°F with proper layering
AERODIVE Series
Performance Range
Temperature Range: 35°F to 55°F (2°C to 13°C)
Best For: High-output activity in cool conditions
Construction
- Technical stretch fabric
- Light insulation in core areas
- Uninsulated high-mobility zones
- Maximum breathability
- Aerodynamic fit
Layering Recommendations
35-45°F: Base layer + AERODIVE technical layer
45-55°F: AERODIVE alone or with light base
Above 55°F: AERODIVE for wind protection during high output
Activity Guidelines
High Output: Comfortable to 25°F (designed for this use case)
Moderate Activity: Comfortable to 35°F
Low Activity: Comfortable to 45°F
Layering System Guide
Base Layer
Purpose: Moisture management and warmth foundation
Materials: Merino wool or synthetic moisture-wicking fabrics
Temperature Impact: +5-10°F comfort range
Mid Layer
Purpose: Primary insulation
Materials: Fleece, synthetic insulation, or down
Temperature Impact: +10-20°F comfort range depending on thickness
Outer Layer (THREE HILL)
Purpose: Weather protection and final insulation
Materials: Technical shells and insulated layers
Temperature Impact: Varies by series (see above)
Wind Chill Considerations
Wind Impact on Temperature
| Actual Temp | 10 mph Wind | 20 mph Wind | 30 mph Wind |
|---|---|---|---|
| 40°F | 34°F | 30°F | 28°F |
| 30°F | 21°F | 17°F | 15°F |
| 20°F | 9°F | 4°F | 1°F |
THREE HILL windproof construction significantly reduces wind chill impact, maintaining comfort in windy conditions.
Activity Level Definitions
Low Activity
Standing, walking slowly, minimal movement
Examples: Casual wear, light walking, spectating
Moderate Activity
Steady movement with periodic breaks
Examples: Hiking, cycling, general outdoor activities
High Output
Continuous vigorous movement
Examples: Running, intense cycling, high-intensity activities
Personal Factors
You May Run Warmer If:
- Higher metabolism or body mass
- Accustomed to cold climates
- Engaging in high-output activities
- Wearing comprehensive layering system
You May Run Colder If:
- Lower metabolism or body mass
- Accustomed to warm climates
- Engaging in low-activity pursuits
- Minimal layering
Selecting the Right Gear
Questions to Ask
- What's the expected temperature range?
- What's my activity level?
- Will I encounter wind or precipitation?
- Do I run warm or cold?
- What layers will I wear underneath?
When in Doubt
It's easier to vent excess heat than generate warmth. If between options, choose the warmer system and use ventilation features to regulate temperature.
Need Help Choosing?
Contact us at Hello@threehill.com with details about your intended use, typical conditions, and activity level. We'll provide personalized recommendations.