1970s: The 1970s saw many large advances and changes in the football boot design. These included lighter boots and a variety of colours. Boot sponsorship also became more widespread. Adidas was the market leader in this period, releasing new technologies such as padding to provide heel protection. At the end of the decade, in 1979, it cemented its status by releasing what has gone on to become the best selling boot of all time, the Copa Mundial. During this time period, some of the most common types of natural leather came into production: kangaroo leather, calfskin and full-grain/cow leather. Diadora entered the market in this decade.