Extreme Line Thermal Base Layer Top - Summit Outdoor - OD Green

The Extreme Line Top is a high-performance thermal base layer designed for use in extreme cold conditions, recommended for temperatures between -20°C and -10°C. Made from advanced technical materials, it delivers an excellent balance of thermal insulation, breathability, and comfort, making it the ideal first layer for outdoor activities during the cold season.

The fabric is manufactured using Double Soft Knitting technology, a dual-layer knit structure that helps retain body heat while ensuring effective temperature regulation without compromising breathability. The chest and sleeves are made entirely from Climatherm technical fiber, which provides excellent thermoregulation and maintains optimal comfort during both high-intensity activities and periods of rest.

The inner surface features a micro-terry construction that efficiently wicks moisture away from the skin, helping keep the body dry. Its soft texture provides a smooth, comfortable feel against the skin, even during prolonged wear.

The ergonomic, body-hugging fit follows the body's natural contours, while the light compression around the chest offers additional support without restricting movement. Its seamless tubular construction around the torso minimizes friction and enhances overall comfort.

The raglan sleeves are finished with flatlock seams to reduce irritation and maximize shoulder mobility. Integrated thumb holes keep the sleeves securely in place while providing additional protection for the wrists and helping prevent cold air from entering. The extended back length ensures better coverage of the lower back for increased warmth.

Features

• Recommended for temperatures between -20°C and -10°C
• Double Soft Knitting technology for superior thermal insulation
• Climatherm technical fiber on the chest and sleeves
• Thermoregulating properties for consistent body temperature
• Micro-terry inner layer for efficient moisture management
• Ergonomic fit with light chest compression
• Seamless tubular torso construction
• Crew neck design
• Raglan sleeves with flatlock seams
• Integrated thumb holes for improved fit and protection
• Extended length for enhanced lower back coverage

Recommended Use

Ideal for hiking, trekking, mountaineering, skiing, snowboarding, hunting, fishing, camping, cold-weather running, cycling, and other outdoor activities in low temperatures. Designed to be worn as a base layer beneath technical clothing, helping maintain a stable body temperature and lasting comfort throughout the activity.