This sixth version of the Vapor Glove Leather takes a stride to a new direction, by offering a touch of support and a thicker sole. It's still firmyl in the barefoot product category, while offering more protection and cushion than the most minimalistic models. This model even has a (relatively thin) EVA foam insole. - Merrell Barefoot 2.0 structure guides your foot to a natural position - 0 mm heel to toe drop - Stack height: 6 mm, lug depth 2.5 mm - Durable full grain leather upper - Cleansport NXT treatment against odour problems - Laces, liner and insole are made of 100% recycled fiber, and the midsole contains 30% recycled fiber - Vibram Ecostep outsole with 30% recycled rubber It's a good idea to start barefooting bit by bit - you want to create a steady upward slope in your strength and coordination, without having to spend days or weeks recovering from an overdone exercise.