RYKA Women's Vida Rzx 2 Cross-Trainer Shoe 100% Mesh/Synthetic/Lycra Imported Rubber sole Weighs 7.8 oz Layered mesh upper provides breathability with 3d print overlays for targeted support. Independent lycra comfort collar for a secure and comfortable fit Anatomical precise-return footbed Rzx: re-zorb high impact cushion in the heel & ultra flex forefoot; the best in cushioning and flexibility Rubber outsole, with strategic flex grooves