The　superior　capability　of　bearing　thermal　and　mechanical　loads　to　other　types　of　open　cellular　materials　has　led　to　advances　in　developing　new　periodic　cellular　materials.　We　introduce　a　lightweight　X-type　lattice　fabricated　via　the　metal　sheet　folding　and　present　its　thermo-fluidic　characteristics　in　single-phase　forced　convection.　For　fixed　porosity,　thermal　conductivity　and　Reynolds　number,　the　X-type　lattice　provides　overall　heat　removal　capacity　up　to　two　times　higher　than　reference　periodic　cellular　materials.　The　unique　morphology　of　the　X-type　lattice　results　in　a　large　scale　spiral　primary　flow,　which　interacts　with　several　secondary　flows.　These　fluid　flow　behaviors　and　the　induced　complex　flow　mixing　substantially　enhance　heat　transfer　on　both　the　substrate　and　ligaments.　However,　the　X-type　lattice　causes　roughly　three　times　higher　pressure　drop　than　reference　periodic　cellular　materials　for　a　given　Reynolds　number.　Overall,　superior　heat　transfer　is　achieved　by　the　X-type　lattice　for　a　fixed　pumping　power.　(C)　2014　Elsevier　Ltd.　All　rights　reserved.