Industry-leading Aerogel insulation and innovative construction allow L.L. Bean to make these super-warm winter boots 50% lighter than traditional pac boots.Upper is made from lightweight but durable, wind- and water-resistant nylonRound toeLace-up vampLined with soft and cozy fleeceTEK2.5 waterproof, breathable membrane keeps moisture out200g Primaloft insulation for warmthEVA midsole provides athletic shoe cushioning and supportAerofoam insole board provides extra warmthLightweight rubber outsole with aggressive ladder lugs for sure-footed tractionImported