Supercharge your run with the lightning-quick speed of the New Balance® Vazee Sigma racing spike.Track and field racing spike. Synthetic upper materials. No-sew upper application helps reduce the likelihood of irritation. boa® closure system allows for precise adjustments that promote a custom fit. Bootie construction offers a snug, secure feel. Textile bootie and interior offers a great next-to-foot feel. Thin textile footbed. Eight-spike configuration delivers aggressive traction. Last: RL-2.Imported. Measurements: Weight: 6.4 ozProduct measurements were taken using size 9.5, width D - Medium. Please note that measurements may vary by size.