2XU Women's 3/4 Hyoptik Thermal Compression Tights 100% Other Fibers Imported PWX TECHNOLOGY - superior knit with the highest grade elastane. HYOPTIK Reflective Logos - For superior visibility in diminishing light. Brushed Interior Thermal Layer - Sits softly next to the skin for added warmth. Compression Support - For greater protection to abductor, glute, quad, hamstring and calf muscles. Graduated Compression - Helps to improve blood circulation.