Upper Material: [face fabric] oiled nubuck leather, ripstop textile, [heel clip] TPU, [laces, webbing] 100% RPET (recycled polyester) Waterproofing: B-DRY membrane Insulation: 200g PrimaLoft Bio (100% recycled materials) Closure: lace Last: board When the season's first snowflake floats down, we put our galoshes away and pull out the Sphinx Mid. Filled with heat-trapping fibers and coated in wet-deflecting tech, this boot keeps our feet unaware of the freezing temps and slush outside. From hard-packed snow to wet ice, the arctic-ready sole bites down hard while remaining gentle on our wood flooring.