New Balance Men's MT610BS 100% Synthetic and mesh Imported Rubber sole Synthetic/Mesh Upper - Provides lightweight comfort and support throughout. AT-Tread - A dual-use outsole tread combining both trail and running lug design for on and off-road. N-Durance - A rubber compound outsole designed for maximum durability. N-FUSE - This combines the foam of two different densities. The top foam is less dense for soft cushioning, while the denser bottom foam provides support and compression set resistance. IMEVA (injection-molded EVA foam) midsole - for firm yet flexible cushioning.