The North Face ThermoBall Traction Bootie in Phantom is built for cozy warmth and reliable grip, whether you’re at base camp, après ski, or braving chilly mornings. The upper is crafted from 100% recycled PET ripstop with a non-PFC durable water-repellent finish to help shed light moisture. Inside, ThermoBall™ insulation made from 100% recycled polyester keeps feet warm even when wet. A slip-on design ensures easy on-and-off wear, while the outsole—made with up to 20% recycled rubber—provides dependable traction on slick surfaces. Lightweight, sustainable, and ultra-comfortable, it’s a cold-weather essential.