The Altitude Tee was engineered for those who demand performance and refuse to settle. Near weightlessness & excellent breathability combined with a thoughtful design will keep you comfortable whether you&';re trail running, hiking, at the gym, or in almost any other performance oriented setting: Ultralight and Breathable: Designed for year-round use, the Altitude Tee offers near weightlessness and exceptional breathability. Whether you&';re tackling hot summer hikes or braving freezing winter expeditions, the 2 - 3 oz base layer will allow you to breathe & stay comfortable. Moisture Management: Stay dry and comfortable no matter the conditions. The performance synthetic fabric wicks moisture away from your skin and dries rapidly, ensuring you stay cool and dry during high-intensity activities. Athletic Fit: Enjoy a comfortable yet athletic fit that&';s not tight or restrictive. This allows the synthetic blend to effectively manage moisture while providing freedom of movement for any performance-oriented setting. Simple & Comfortable: With no hardware, the Altitude Tee offers simplicity and decreased weight, allowing you to focus on your performance without distractions. Sun Protection: Prevent sunburns with the long sleeve option without sacrificing weight or breathability. Stay both cool & protected during adventures. Experience pure performance with the Altitude Tee. No frills, just reliable comfort and functionality for your most demanding adventures.