Flylow Puffer 3/4 Pant Women'sIt 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 3 4 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. Flylow's point: Insulated long underwear has a place in this world.