Polarmax Men's Double Layer Crewneck Long Sleeve Base Layer Shirt - Made with special 2-layer soft jersey knit, this men's thermal top is sure to keep you warm when you need it most. Crew neckline with binding Spun polyester is slightly brushed for extra softness Double layer traps air between layers for extra warmth Flat seam construction for seam strength and longevity Everyday warmth Midweight warmth with a relaxed fit 100% polyester Style: PM1101