The Micro-Elite Chamois Premium Zip-T is a midweight base layer built on Hot Chillys' signature fabric, brushed against the skin for warmth and smooth on the outside for a clean layer under a shell. Moisture Transfer Fibers pull sweat away from the body instead of letting it sit, while Bio-Silver technology and activated carbon keep odor from building up over repeated wears. The result is a top that holds its warmth through a full day out without trapping the sweat that makes cold feel colder. What Our Gearhead(R) Experts Are Saying:"I zip this down on the skin track when the effort ramps up, then zip it right back to my chin the second I stop climbing. That's the whole point of a quarter-zip base layer: heat management on demand instead of stripping a layer at the top."