Ariat Childs Aptos Short Sleeved Show Shirt White. The Childs Aptos Show Shirt is a beautiful competition shirt that has been created for both comfort and optimum flexibility whilst in the saddle. The Aptos Shirt offers a classic look made from a highly breathable, stretch poly blend fabric with a mock collar, stock tie loop and a placket with snap closures. The Aptos Shirt has been designed to flex around the rider to offer less restriction and enables a full range of movement whilst in the saddle for ultimate performance. The Aptos Shirt features Ariats Moisture Movement Technologyâ ¢ which helps to wick moisture away from the skin and adds comfort whilst being worn.