Designed for 5k to half-marathon distances, our FuelCell SuperComp Pacer contains Energy Arc technology, a carbon fiber plate and a double-layer springy FuelCell midsole to help propel your strides forward. These racing flats also feature a single-layer engineered mesh upper for breathability and a lightweight feel. The sleek design offers runners a lower stack height racing solution and a snappy ground feel.Woven textile and synthetic upper with branding.Textile lining and insole.Composite toe.Lace closure.Lift-back for support.Ribbed midsole.Synthetic wavy outsole.Imported.Product measurements were taken using size 9, width B - Medium. Please note that measurements may vary by size.Measurements: Weight: 6 oz View Zappos.com Glossary of TermsFind something wrong in this description? Help us fix it! Report An Error