The Banded Core Base Layer uses body-mapping technology, making it technically superior to any other base layer on the market. The PrimaLoft Silver insulation is strategically located in areas of rapid heat loss in cold conditions. Body mapping technology ensures maximum insulation where you need it most while keeping the body from overheating. Combine that with polyester and elastane for maximum wicking capability and this layer will keep you in the field when lesser garments would have you heading home. The Banded Core Base Layer surpasses even the finest wool base layers in warmth management, wicking, and breathability. Banded Core Base Layer is more comfortable against the skin and at a lower cost. In addition, the polyester/elastane blend of Banded's Core Base Layer will not sag over time like wool, providing more long term fit retention translating into better value for your hard-earned dollar. Banded Base Layer, turning technology into comfort.