Columbia Men's Size Chart Get the insulation of a bulkier baselayer without the weight in the Midweight Stretch Baselayer Shirt. Performance Fit is a body-mapped design, contoured to move with you. Omni-Wick™ fabric:• Moisture-wicking fabric moves perspiration away from the skin to dry quickly on the surface.• Four-way stretch for improved range of motion.• Antimicrobial treatment reduces accumulation of odor-causing bacteria. Omni-Heat™ reflective lining:• Metallic lining reflects body-generated heat for improved warmth retention.• Backing dissipates excess heat.• Membrane comprises 65% of lining for high breathability. Friction-reducing flatlock seams are ergonomically placed to improve mobility. Crew neck. Long raglan sleeves. Droptail hemline. Logo print at the chest. 85% polyester, 15% elastane. Machine wash and tumble dry. Imported. Measurements: Length: 32 in Product measurements were taken using size LG Tall. Please note that measurements may vary by size.