From Hunter Boots, the Original short men's rain boots feature: vulcanized rubber upper slip-on construction quick dry knitted nylon lining multi-layer cushioned sponge insole traditional calendered natural rubber outsole Imported. BLOOMING: Occasionally, you may notice a white powdery "bloom" on your Hunter rubber wellington boots. This is because rubber is a natural product and in certain conditions, insoluble particles may rise to the surface. This is a common process, characteristic of high quality, natural rubber and nothing to worry about. It will not affect the performance or durability of your boots. A pristine finish and shine can be easily restored with regular use of Hunter Boot Buffer or Instant Boot Shine