Skins Men's A400 Compression Long Sleeve Top 76% Nylon/24% Elastane Imported World's first dynamic Gradient compression delivers more oxygen-filled blood to active muscles, increasing endurance, power, and efficiency Adaptive HEIQ Technology for state-of-the-art temperature and moisture management. To view the size chart click on the first image. Flat bonded/taped hems and flat sitting, flexible, chafe resistant A-Seam Enhanced support through the core/trunk area for supreme postural support SKINS performance compression: it's equipment, not clothing, 76% Polyamide/24% Elastane World's first Dynamic Gradient Compression delivers more oxygen-filled blood to active muscles, increasing endurance, power, and efficiency Adaptive HEIQ technology for state-of-the-art temperature and moisture management Flat Bonded/Taped Hems and flat sitting, flexible, chafe resistant A-Seam SKINS Performance Compression: It's equipment, not clothing