2XU Men's Hyoptik Thermal Compression Tights 75% Nylon/25% Lycra Imported Flatlock seams to reduce chafe. High filament yarn for dryness, moisture wicking. Antibacterial and UPF50+ sun protection. Men's has a 3.5 cm wide flat waistband with drawstring. Women's has a comfort power wide waistband with powermesh for smooth streamlined fit.