First Ascent Thermo-Adaptive Jacket Featuring 37.5

The Men’s Thermo-Adaptive Jacket Featuring 37.5® — next-generation fleece engineered for maximum performance. 37.5® climate-control technology removes moisture vapor before sweat forms , regulating your microclimate for optimal comfort during any activity.

• 37.5® particles remove moisture before sweat
• Maintains optimal body microclimate
• Soft waffle texture for lightweight warmth
• Full front zip for easy wear
• Mechanical stretch for freedom of movement
• FA3490