Heattech is a proprietary Uniqlo cloth material that traps in heat and helps keep you warm. This T shirt is designed to be worn under other clothing for maximum warmth! The scoop neck works with a variety of other layers and necklines. No rips, tears or stains. A few extremely small pulled fibers that are difficult to see(shown in closeup photo) but as this is an underlayer it should be an issue! Size small