Under Armour Long Sleeve Mock Baselayer Top ColdGear features a double-sided fabric that circulates body heat and reduces moisture. ArmourStretch improves mobility and accelerates dry time with fabrics built in a 4-way stretch. Anti-Odor Technology prevents the growth of odor causing microbes. Terry-twill poly inner traps heat for enhanced warmth. Compression fit for bolstered muscle support and increased circulation resulting in higher efficiency output and increased stamina.