The Alpha Pullover in Black from Purple Mountain Observatory, UK. 

Details
Pullover constructed from Polartec® Alpha™ Direct 90 fleece, engineered for dynamic insulation that adapts to your activity level. Designed to regulate body temperature during stop-and-go pursuits, it retains warmth when you need it and releases heat when you don’t. The fabric’s moisture-resistant and quick-drying properties ensure optimal performance during high-intensity outings.

An essential layering piece for versatile, technical comfort.