Marmot Women's Trail Breeze 3/4 Tight 80% Nylon, 20% Elastane with Polygiene Technology 7.1 oz/yd - 91% Polyester, 9% Elastane Mesh with Polygiene Technology 4.7 oz/yd Imported Quick-Drying and Wicking Breathable, Stretch, Light Weight Performance Nylon Fabric Polygiene Technology Finish Which Gives Permanent Odor Management Ultraviolet Protection Factor (UPF) 30 Mesh Paneling behind the knees for added breathablility