Lightweight and comfortable. Ideal for workouts or casual wear. I believe this is the Lululemon Metal Vent Tech Short Sleeve V 2.0 Midnight Shadow / Tempest Blue The ultimate technical training tee—built to perform sweat after sweat seamless construction Fabric is seamlessly constructed with yarns chosen for movement and shape retention—over time, and when they're soaked in sweat. Lightweight Retains shape features Designed for: On the Move Reduced chafing : Seamless construction reduces chafing Ventilation: Mesh construction for breathability Recycled polyester: 100% of the polyester in this product is recycled please note the stock photos included are of a similar style to show the fit and approximate color. please refer to non-stock photos for exact item details ✔️ fast shipping ✔️ smoke-free home ✔️ ⭐️⭐️⭐️⭐️⭐️ seller ✔️ bundle & save! 🎉 ✔️ feel-good purchase 🐶❤️🐱 100% of all sales are donated to amazing non-profit animal rescue organizations!