65% Polyester, 35% Polypropylene Imported 2-LAYER CONSTRUCTION with wicking technical fibers for superior moisture management and lightweight insulation OCEANBOUND RECYCLED MATERIALS for an eco-friendly active base layer crew that doesn't compromise on performance MOISTURE-WICKING FIBERS designed to keep you dry and comfortable in this active base layer crew HH PERFORMANCE STRIPES with lightweight insulation for all-day warmth and comfort in your active base layer crew SUPERIOR COMFORT with lightweight insulation for an active base layer crew you can wear all day