New model for this year (Do not check this option if this model was listed as new in last year's Gear Guide)The 1521 incorporates a variety of the features that made its predecessor so appealing. The shoe features GORE-TEX® Extended Comfort for advanced waterproof protection, breathability, and durability with optimized climate comfort, a Vibram® outsole for multi-directional traction, and ABZORB® cushioning in the heel for comfort and shock absorption. A Rock Stop plate provides underfoot protection and torsional rigidity while a suede/mesh upper offers lightweight comfort and breathability.New Balance has reduced the amount of material on the shoe and increased flexibility. A revised lug configuration on the outsole offers increased flexibility and improved traction, more strategic placement of the Vibram® compound ensures maximum traction and durability. The removal of excess material from the tip allows for increased flexibility, and the upper features new details in the rubber saddle and laser perforations.