TCK Neon Kaleidoscope (Blue, Large) 77% polypropylene Shoe Size: Small - Youth 12-4 Womens 4-6, Medium - Womens 6-9 Mens 5-8, Large - Womens 9-12 Mens 8-11, X-Large Womens 12+ Mens 11+ Moisture/Odor Control Antimicrobial, Blister Control Breathable Mesh, Ergonomic Cushioning Arch Compression, Heel/Toe Construction Fiber Content: 77% Polypropylene, 17% Nylon, 3% Elastic, 3% Lycra? Spandex