The Adidas Ultra Boost LTD shoes feature an adidas Primeknit fabric upper that accompanies the natural movement of the foot. It includes strategic reinforcements in the midfoot and heel that offer you a more secure fit. Color Limited Edition 5 Anniversary. Limited Units. The Ultra Boost LTD shoes incorporate Boost technology that provides you with unlimited energy return. It has a very grippy sole that gives you excellent traction and stability. Characteristics: Shoe type: neutral for flexibility, versatility and cushioning Boost technology is our best cushioning system: the more energy you put in, the more energy you get The adidas Primeknit fabric upper conforms to the foot and provides greater support, comfort and lightness; reflective knit upper Torsion System technology provides greater stability and flexibility; wraparound side gusset for a more secure fit and greater support Fitcounter with lateral stabilizer and molded heel that protects and promotes natural movement of the Achilles tendon Weight: 310 g (size 42 2/3) Drop: 10 mm (heel: 29 mm / forefoot: 19 mm)