adidas Techfit Cool Short Sleeve T-Shirt Climacool Technology - Channels fresh air to skin, drastically reducing the build up of air and heat within the garment. Techfit - Supports muscles and posture, boosting power output and energy efficiency. Flatlock Seams - Eliminate potential skin irritation and chafing. Mesh Crew Neck - Ensures breathability is preserved and air circulation is frequent when necessary. Compression Fit - Decreases warm up time, increasing the flow of blood to your muscles for performance and recovery enhancement.