Design: Synthetic/mesh construction Adjustable lace closure for a customized fit Toe Protect technology helps protect feet from rocks, roots and debris In-Shoe Comfort: Fresh Foam X midsole foam with approximately 3% bio-based content delivers incredible comfort Durability & Traction: Two-part midsole offers enhanced durability Additional Details: 4mm drop (due to variances created during the development and manufacturing processes, all references to 4mm drop are approximate)