Turn up the power with every stride of the 2 Qw-k track spike from Brooks®!Ideal for distances up to 400 meters. Lightweight synthetic uppers with welded TPU overlays for structural support. Lightly cushioned collar for a great next-to-skin feel. Breathable fabric lining. Full-length Pebax™ Rnew sprint plate. TubEffects Support Structure for a smooth, stable ride.Eight-spike design. Includes eight 6 mm spikes and wrench.Molded foam insole.Imported. Measurements: Weight: 5 ozProduct measurements were taken using size Men's 5, Women's 6.5, width Medium. Please note that measurements may vary by size.