2XU Men's Compression Sleeveless Top 80% Nylon/20% Elastane Imported Powerful 70D fabric supports muscles for better posture while working out Mesh paneling provides increased ventilation and breathability Graduated compression with invista LYCRA increases circulation for less muscle soreness and faster recovery Antibacterial and moisture-wicking properties keep odors and sweat in check 50 UV fabric adds extra protection against the sun's rays Supports and protects shoulders, deltoids, back and core muscle groups Muscle Containment for reduced vibrations & oscillation, less fatigue & muscle damage Better muscle alignment for increased power & endurance, better postural position and improved breathing and agility Mesh paneling for increased ventilation and breathability with SPF 50+ sun protection for all day comfort Certified 70 Denier Invista LYCRA Compression with a 360 degree fabric knit construction for a consistent yet powerful pressure