To achieve ultimate lightweight, the midsole plays a more crucial role than the upper. The midsole accounts for about 25 percent of the weight of a badminton shoe and is key to the wearing experience. It is challenging to manufacture a midsole that can deliver both lightweight and incredible wearing experience. The NITRO-LITE midsole of S99ELITE is the groundbreaking solution to the problem. Unlike traditional method of making midsoles, the innovative technology impregnates high performance EVA with nitrogen to make the embryos filled with gas and rapidly inflated under pressure difference. The NITRO-LITE midsole is not only lightweight but also has fine and evenly distributed apertures, which makes the structure stronger than traditional foaming material after moulding and shaping.