It's Under Armour 's dedication to creating highly functional, cutting-edge fabrics that makes it one of the most reliable sportswear labels around. - These 'Reactor' tights are crafted using ColdGear® technology that adapts to your activity level to offer the right amount of breathability and warmth - The hexagon-patterned stretch-jersey fabric locks in heat while simultaneously allowing air to flow through - Mesh panelling provides strategic ventilation - Built-in four-way stretch ensures optimum manoeuvrability Shown here with Under Armour shorts, Under Armour T-shirt. - - Black stretch-jersey - Elasticated waistband, mesh seat, reflective designer emblem - 86% polyester, 14% elastane; trim1: 87% polyester, 13% nylon; trim2: 80% nylon, 20% elastane - Machine wash