adidas Ultra Boost - Women's Take your run to a whole new level with the out-of-this-world cushioning and response of the adidas Ultra Boost. Seamless Primeknit upper stretches with the foot for a breathable, comfortable fit. Four-way stretch heel works with the tongue and butterfly heel counter to hold you in place while offering dynamic support. Full-length boost midsole provides the best in energy return and cushioning. TOSRION SYSTEM creates a smoother transition from heelstrike to midfoot stance. Stretch web outsole adapts to all surfaces and supports your foot's natural movements. Wt. 9.4 oz. adidas' 30-day, worry-free guarantee: if you're feeling anything but a cushioning revolution, simply return your BOOST shoes within 30 days for a full refund. Please refer to the adidas BOOST Guarantee for terms and conditions and return policy.