Cold weather in the mountains means you should wear versatile clothing, like the Opside jacket for men from Rossignol. It can be worn under a shell jacket to stay warm while skiing, or on its own during your hikes or ski tours. The breathable synthetic insulation ensures you stay warm without being bulky and helps regulate your temperature when you start to sweat. The stretchy fabric and pre-shaped sleeves support natural movements. It features a classic and fitted cut for freedom of movement. The elastic material allows you to move without limits. It has powerful and lightweight insulation made from recycled materials. The breathable Primaloft® Black insulation, made from 100% recycled plastic bottle materials, keeps you warm and resists moisture. GRS-certified insulation (Global Recycled Standard) ensures verified recycled content. It is waterproof without harmful fluorocarbon-based chemicals. It includes a durable water-repellent treatment (DWR) that protects against light showers.