The cold days in the mountains require versatile clothing like the sleeveless Opside jacket for men from Rossignol. You can wear it under waterproof clothing to stay warm in the mountains, or on its own during your Nordic ski tours or hikes. No matter how you enjoy the cool weather, the breathable synthetic insulation ensures you stay warm without feeling restricted, and helps you regulate your temperature when you heat up. The stretchy fabric and pre-shaped sleeves support natural movements. Classic and slim fit. Freedom of movement. Elastic material for unrestricted motion. High-performance and lightweight insulation made from recycled materials. The breathable Primaloft® Black insulation, made from 100% recycled materials sourced from plastic bottles, keeps you warm and is moisture-resistant. GRS (Global Recycled Standard) certified insulation for verified recycled content. PFC-free water resistance. Includes a durable water-repellent treatment (DWR) that protects against light rain without using toxic fluorocarbons.