Although there are a lot of waterproof insulated boots on the market, it is hard to find a model that is truly lightweight. The Keen Growler is one of the lightest available, has a waterproof/breathable liner, 200-gram insulation, and weight of 19.6 ounces/boot (men’s 9).
The original Growler had an eVENT membrane to make it waterproof and Primaloft insulation, but the current model uses proprietary KeenDry waterproof/breathable technology and KeenWarm insulation. The Growler is claimed to be warm down to -20 F, which may be a bit optimistic. Sizes: Men’s 7-14, women’s 5-11. MSRP: $124.99.
We chose the Grower because it uses mostly synthetic materials to minimize weight, its tread provides excellent traction, and its roomy interior provides ample room to wear thick socks.