Premium indoor and outdoor slippers, the Outdoor Research Tundra Trax Booties sure beat our regular sandals for warmth and versatility. The booties feature a lightweight but abrasion-resistant Pertex Quantum Eco shell with premium Primaloft Gold insulation that's comparable to 750-fill down in its loft and warmth. That keeps them light and packable if we're backpacking and warm and durable wherever we're wearing them. The rubber soles let us wear the Tundra Trax inside and outside, which is perfect for warming up our feet at our campsite, toasting them inside our cabin, or running quick errands outside the house to grab the paper, check the mail, or walk the pooch.