Under Armour Junior HeatGear Sonic Fitted 4 Inch Short Fitted - Sits close to the skin for a streamlined fit without the squeeze of compression. Ultra-soft - Smooth fabric provides extreme comfort with very little weight. 4-Way Stretch Fabrication - Allows greater mobility and maintains shape. Signature Moisture Transport System - Wicks sweat away from the body. Anti-Odor Technology - Helps to prevents the growth of odor causing microbes.