adidas Cosmic Boost - Women's With a lightweight Primeknit upper and BOOST foam cushioning, you're in for an out-of-this-world running experience. Seamless Primeknit upper for a close fit and sock-like comfort. ClimaChill provides 360-degree ventilation to keep you feeling dry and fresh. BOOST foam midsole features thousands of energy capsules that store and release energy with every step. Grippy rubber outsole for long-lasting traction. Wt. 7.0 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.