Compression: Ultra-tight, second-skin fit for a locked-in feel. Super-light HeatGear® fabric delivers superior coverage without weighing you down Signature Moisture Transport System wicks sweat to keep you dry & light Lightweight, 4-way stretch construction improves mobility & maintains shape Anti-microbial technology keeps your gear fresher, longer Ergonomic flatlock seams deliver a comfortable, chafe-free fit Wide, flat waistband with internal drawcord Water-resistant side zip pocket Super-breathable mesh leg panels to dump excess heat Reflective logos deliver greater visibility on low-light runs 80%Polyester 20%Elastane