Sub Sports Mens Thermal Long Sleeve Crew Neck Vest Top with a Brushed fleece inner for Warmth, Base Layer, Moisture Wicking, Compression Fit - Maroon - US S (UK M) OPTIMUM MUSCLE TEMPERATURE soft internal fibres provide superb insulation and comfort MUSCULAR POWER & ENDURANCE compression fit improves blood flow and oxygen supply to your muscles STAY DRY moisture wicking fabric transports sweat away from the skin PLEASE NOTE: This item runs small. For best fit, please order the next size up