95% Polyester, 5% Elastane. This top features a classic crew neck and long sleeves, designed for active wear. The fabric is engineered to be breathable, IsoCool, lightweight, moisture-wicking, and quick-drying, ensuring comfort during any activity. It has a relaxed fit for ease of movement. Please wash before first use. Available sizes include 4 UK (32 in.) up to 24 UK (52 in.).