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adidas Ultra Boost ST Women's Running Shoes Feel the power of your best run in these women's running shoes that combine an energy-returning ride with optimal stability. When you're building distance or pushing for speed, these shoes propel you forward with a plush boost midsole that returns the force from each footstrike. A lightweight, adaptive adidas Primeknit upper and ergonomic heel give you support right where you need it. The limited edition shoe has a STRETCHWEB outsole that provides a smooth, stable heel-to-toe transition. Primeknit Upper The upper of the adidas Ultra Boost ST is constructed with Primeknit. While sports shoes are usually made from many separate pieces, the Primeknit method digitally knits the entire upper in just one piece. Knitting fused yarn allows adidas to fine-tune the exact amount of flexibility and support needed in every part of the shoe. This means lightweight comfort that wraps seamlessly around your foot, whilst fewer materials produce less waste. Primeknit also offers great breathability, ensuring the feet are kept cool and dry throughout a run. Midfoot support for stability is featured in the form of the plastic 3 Stripes Logo located on the side of the upper, while the heel also shows a sturdy external heel counter for a more stable heel. BOOST Midsole Previous Boost models sport only 80% of the Boost midsole while the Ultra Boost ST features 100% of it in the midsole. With 20% more of these TPU energy pellets, runners are sure to have a more responsive ride. The Boost uses a material called thermoplastic polyurethane (or TPU) to form its bundle tightly packed sole nuggets. Just like the more traditional midsole material, EVA, TPU compresses under pressure for shock absorption - what's unique about the adidas tech is the ability to instantly bounce back to its original shape. Holding the shoe together and making each transition smoother, is a plastic insert called the Torsion System which helps support the arch and