Sorel Toddler Whitney II Strap BootWINTER'S BEST An easy choice for winter fun, these boots are cozy, comfortable, and easy to slip on and off. The waterproof upper is fitted with a soft microfleece bootliner, plus 200g insulation for even more warmth. Combine that with the EVA foam footbed and molded rubber sole, and you've got the recipe for happy little feet. UPPER: Waterproof nylon upper and PU coated synthetic overlays. Available with faux fur collar textile collar or felt collar.