82% Polyester/18% Elastane. We brushed the fabric on the outside and kept it'smooth on the inside for a Zip that feels just as good when you're working as it does when you first pull it on. It also wicks sweat and stays in place.. Ultra-soft double-knit fabric is breathable & comfortable. 4-way stretch material moves better in every direction. Generous zip front makes for easy layering. UA logo at left sleeve