Home / In the Press / Feb 09, 2023 IRUNFAR - MT-4 (August 2021) Topo’s made a few changes in evolving the Topo MT-4 from the MT-3, including switching to a lightweight, breathable mesh upper, a dual-density midsole, and a Vibram XS Trek Evo outsole, as well as adding Topo gaiter compatibility. Share Share on Facebook Tweet Tweet on Twitter Pin it Pin on Pinterest