EUC Size Medium Signature seamlines, strategic ventilation Iconic mesh seaming across the back adds airflow where you need it. Distraction-free storage Redesigned low-bounce hand pockets and a zippered pocket provide plenty of distraction-free storage. New waistband, new feel Ultra-soft inner waistband keeps your mind on your movement. More room to move Redeveloped for more room around the hips and thighs. Performance-ready fabric Lightweight, sweat-wicking Swift fabric keeps you dry and comfortable no matter how you move. Materials and Care Mesh: 90% Recycled polyester, 10% Lycra® elastane Pocket lining: 100% Recycled polyester Body: 86% Recycled polyester, 14% Elastane Liner: 85% Recycled polyester, 15% Elastane