Circle Endurance Long Sleeve T‑Shirt – Engineered to perform as a second-skin base layer, this long-sleeve running top combines seamless recycled fabric with mesh ventilation zones for climate control and comfort in cold-weather runs. It features thumb loops and a watch port for ease of use and reflective sleeve detailing for visibility. Designed and made in Europe from 94% recycled polyamide, this top is fully recyclable and supports a transparent, sustainable supply chain.