Merrell The leadership in the barefoot category continues with the Vapor Glove 6. These are the most minimal footwear Merrell creates, with a Vibram® EcoStep outsole that wraps the foot to maximize grip and connection, and a breathable mesh upper to keep feet cool. The Vapor Glove 6 offers maximum lightweight performance in minimalist trail running and training design. The total stacking height of these shoes is 6 mm. Return barefoot with the Vapor Glove 6.