Marmot Men's Stride Long Sleeve Tee 82% Polyester 18% Elastane Mesh 5.0 oz/yd - 80% Polyester, 20% Elastane 5.3 oz/yd Imported Contrast Flat- Locked Seams for Added Comfort Soft, Breathable, Lightweight Performance Knit Fabric Ultraviolet Protection Factor (UPF) 30 Quick-Drying and Wicking Mesh Panels for Breathability