Brooks Glycerin 8 is the top model in the neutral category and immediately attracts attention through its extraordinary design. Glycerin has many of Brooks revolutionary technological systems including, Element an upper technology featuring superior microfibre construction to provide weather protection in a light, supple and quiet fabric that does not sacrifice breathability, durability and comfort. HPR, High performance rubber which is an abrasion-resistant rubber outsole compound that has higher durability and wears longer. Midsole and outsole components are engineered using poular technologies to set the foot in an efficient, balanced position from heel strike to toe-off, offering exceptional flexibility and an unrestricted forefoot ride. Good fit, comfort and long-lasting cushioning! The groundbreaking midsole material MoGo is loved by runners. an ingenious polymer structure that is more durable than EVA, offers a softer, more flexible running experience. Its properties are less temperature-related: Variations in rigidity are minimal at both high and low temperatures. A shank-like thermoplastic device provides torsional rigidity to the midfoot, enhancing support while allowing the heel and forefoot to act independently.