Gently worn, like new. No size dot, but would consider it an XS. Measurements taken flat: Pit to pit: 16.5” Front length: 18” Back length: 19” From lululemon: Find your power in this long sleeve designed to keep you cool while you train. The crew neck prevents gape while you move and a smooth Mesh fabric back panel provides ventilation without irritation. Four-way stretch fabric feels cool to the touch, wicks sweat, and dries so fast it’s like magic four-way stretch sweat-wicking dries quickly cool-to-the-touch features Designed for: Training Lycra®: Added Lycra® fibre for shape retention Ventilation: Engineered mesh fabric on the back is smooth and comfortable Coverage: Longer in back