HOKA ONE ONE Tracer Women's Running Shoes Mesh^Synthetic Forefoot Mesh - Ultra-breathable and reduces water retention. No-Sew TPU Overlay Construction - Reduce irritation. Flat Lacing System - Also reduces irritation. Form-Fitting Heel Construction - Provides a secure, plush fit around the heel to prevent slipping. Ortholite Insole - Offers ultimate comfort, cushioning and breathability.