Cold mornings, long days outside and the welcome change into something warm when you're done. Patagonia's Men's Nano-Air Pants bring breathable insulation and easy stretch to the cold-weather routine, without the stiff, bulky feel.

The 60-g FullRange synthetic insulation moves with you and retains warmth when damp. Paired with a soft, breathable polyester shell and lining, it lets excess heat escape as you get moving. A durable water-repellent finish helps shed light moisture, but these aren't rain pants. Keep a waterproof layer handy when the weather turns.

A slim fit keeps things streamlined over baselayers, while articulated shaping gives you room to bend, step and move. The low-profile stretch waistband sits comfortably beneath a pack hip belt, and two drop-in front pockets keep the essentials close. Tapered legs and wide, stretchy cuffs round out a simple, comfortable cold-weather layer.

• Stretch-woven polyester shell and lining made with 87% recycled content
• 60-g FullRange insulation made with 40% recycled content for breathable warmth and freedom of movement
• Soft microtexture for next-to-skin comfort
• Durable water-repellent finish for light moisture protection, not waterproof coverage
• Articulated construction and low-profile quilting for unrestricted movement
• Comfortable, high-stretch pull-on waistband
• Two low-profile drop-in front pockets
• Tapered legs with wide, high-stretch cuffs
• bluesign approved fabric and Fair Trade Certified sewing
• Slim fit, best worn over baselayers