It was a bitter-cold storm day at the resort and a skier was wearing traditional long underwear bottoms—and she was cold. Her friend, on the other hand, was sporting the Puffer Pant, soft fleecy long johns with insulated, 40-gram down panels above the knee in the front and back and a warm, durable Furano Fleece everywhere else. And she was snug and warm and stayed out longer. Our point: Insulated long underwear has a place in this world. Plus, the Puffer Pants—which come to a three-quarter length so they just above the top of your ski boot—are cozy enough to double as sweats around the cabin.

• Gridded fleece with strategically placed insulated panels in the upper thigh where you need the most warmth
• Side seam pockets fit a phone
• Stretch waistband with drawstring
• Average weight: 363g
• Furano Fleece: 90% polyester, 10% elastane
• Pertex Quantum: 100% polyamide
• 40g Primaloft Black ECO