This super-soft Omni-Heat Base Layer Top is ideal for trekking out in wintry conditions. Made from durable, anit-pilling 86% polyester, 14% elastane fabric with 4-way comfort stretch. Omni-Heat thermal reflective lining regulates temperature by retaining body heat while allowing moisture and excess heat to escape. Traps body heat without adding bulk, yet still retains supreme breathability. Omni-Wick advanced evaporation technology offers ultimate moisture management for outdoor activities. Antimicrobial treatment helps reduce odors. Ergonomic seaming lets the top fit close to the body for easy layering. Imported.