Footballers make money from transfer fees, wages, and sponsorship deals.
But the boot deal is an integral part of sponsorship deals that is earning an increasing number of players cool cash.
As expected, the list is dominated by the most popular footballers of today but there are quite a few surprises.
Below are the top-10 most expensive boot deals in world football at present:
1. Cristiano Ronaldo – £6.2m per season Nike deal
2. Mario Balotelli – £5.1m per season Puma deal
3. Gareth Bale – £4.1m per season Adidas deal
4. Cesc Fabregas – £4m per season Puma deal
5. Mesut Ozil – £3m per season Adidas deal
5. Paul Pogba – £3m per season Adidas deal
7. Marco Verratti – £2.7m per season Nike deal
8. Lionel Messi – £2.5m per season Adidas deal
9. Sergio Aguero – £1.5m per season Puma deal
9. Wayne Rooney – £1.5m per season Nike deal