Thermolator base-layer bottoms are made of Terramar's midweight fabric — ultra-soft and featuring ClimaSense Thermoregulation Technology that automatically adjusts to your body temperature. It does this by trapping air to maintain warmth when your body starts to cool down. When your aerobic activity increases and your skin temperature rises, the fabric allows moisture vapor to escape to maintain comfort.

4-way stretch allows movement-mirroring ease, while the midweight polyester/spandex fabric combo drys fast and wicks moisture. Whether skiing, mountaineering, fat biking, snowshoeing, or winter running, the Thermolator is functional performance at its best, allowing you to finish your mission in comfort.

Specs

• A midweight layer featuring ClimaSense Thermoregulation Technology that automatically adjusts to your body temperature
• Fast wicking and quick drying
• 4-way stretch material allows movement-mirroring ease
• Ultra-soft brushed fabric traps air 
• Constructed of 86% polyester / 14% spandex
• UPF 25+ for added UV protection