The Nivia Track And Field Spirit Spikes Have A Breathable Mesh Upper To Keep Your Feet Cool And Comfortable, With A Lightweight Tpu Stitchless Upper When The Pace Heats Up. Asymmetrical Lace Design For Snug Fit, Supportive Tpu Sole Plate. Breathable Mesh Upper With Tpu Fusion Technology In Durable Comfort. It Creates A Better, Healthier Environment For Your Feet To Thrive In. The Fusion Technology Construction Produces An Irritation-Free Fit, Reducing Bulk, Layers, And Weight High Breathable Hexagonal Breathable Mesh Is Light In Weight And Allows You To Move Quickly. Two Layers Of High-Density Foam Line The Collar And Mould To The Athlete'S Foot To Create A Personalised Heel Fit,Adding Soft Support And Custom Comfort. The Die-Cut Soft Nr Eva Sockliner Is Laminated With Polyester Fabric For Additional Cushioning. The Soft Cushion Nr Eva Inner Insole Improves Cushioning And Comfort. Take Flight In Our Nivia Stride 2.0 , Featuring A Rapid Agility Soleplate For Supreme Energy Return And 7 Removable Spike Pins Of Regulation Length On Each Boot. Suitable For Short-Sprint Events.