The Waves Vest Black from Purple Mountain Observatory, UK. 

Details
The Waves Vest is built for adaptability, delivering quick and dependable insulation when you need it most. Crafted with a Crinkle Nylon outer shell treated with a DWR coating, it provides enhanced weather resistance while maintaining a lightweight, packable profile.

Functional details include SunGrip® poppers for quick-release adjustments and hidden zip side pockets for secure, streamlined storage. Whether layered for added warmth or worn on its own, the Waves Vest seamlessly transitions between active and casual wear.