Constructed using an engineered mesh, the upper of the adidas Adizero Boston 9 Running Shoe provides an abundance of flexibility, breathability and support. Designed using research based on Aramis insights, the mesh has been specifically engineered to provide more support in places its needed the most and less support in areas where free movement is important. Not only do the perforations determine levels of support, they also work to increase ventilation so you can remain cool, dry and comfortable at all times. The mesh allows cool air to circulate inside the shoe whilst, at the same time allowing hot muggy air to escape; creating a perfect microclimate for your feet to thrive in. Microfit technology has also been used on the upper to ensure increased structure and support. It works to lock down your feet and midfoot for a secure, comfortable and fast run. A textile lining has also been used on the upper to increase comfort, the lining sits comfortably against the skin and reduces the risks of chafing and irritation from ruining your run. Completing the upper is a lace closure system which secures the midfoot so you can enjoy distraction-free strides.