The ultimate expression of speed on a tennis court. When you lace up these lightweight adizero Ubersonic 4 shoes, you can be sure they'll complement your all-action style. Engineered for agile play, their snug woven mesh upper is reinforced from within to add stability during sidesteps and slides. Sitting on that durable hard court outsole, a Lightstrike midsole keeps you close to the ground for quick reactions. For this product we turned to a greenhouse gas technology. It uses captured industrial emissions as a new material feedstock. CO2 is fermented into ethanol which constitutes 30% by weight of a polyester yarn. We knitted this yarn into various products and now this carbon-based ethanol makes up
