O'Neill Wetsuits Boy's Youth Tech 24/7 Short Sleeve Crew Strategic Paneling for Your Best Performance. The New 24/7 Tech Series utilizes a Highly Breathable, Quick Dry, Nylon/Spandex Composite Fabric. 30+ UV Protection. Recommended and Approved by the International Skin Cancer Foundation. Relaxed Fit for Maximum Comfort and Cooling. Flatloc Stitched