Baw Online Men's Sleeveless Compression Cool-Tek Shirts Details: 82% Polyester / 18% Spandex Cool-tek. 4.75 ounce Breathable, moisture-managing interlock fabric Fresh assurance with anti-bacterial treatment UV Protection Crew neck with double needle hems Features: Antibacterial Treatment: Prevents bacterial growth and stops fabrics from developing odors. Moisture Management: Transports moisture away from the skin to the garment's outer surface. Odor Control: New anti-microbial fabrics wick perspiration and deliver enhanced comfort and performance for under and outer layers. UV Protection: Tight construction and color of fabric blocks UV radiation from passing through and reaching the skin. Tagless: Tagless label prevents neck discomfort. Men's Sizes: AS - A3XL How to Measure: Chest: Measure around fullest part of chest Care Instructions: Machine wash cold. Do not use bleach or strong detergent. Do not dry clean.