Overnight snow turns a lap around the block with the dog into a proper outing, which puts the Siren 4 Thermo Lace WP Boot to work. This winter boot pairs 200 grams of PrimaLoft Gold Eco Series synthetic insulation with a soft faux fur lining for warmth, while a waterproof membrane, waterproof leather upper and TPU shell keep slush and wet snow outside. What Our Gearhead(R) Experts Are Saying:"I stopped shuffling across icy sidewalks once I started wearing these. The sole grips cold, slick ground, so I walk at a normal pace even where the sidewalk glazes over."