Derby County’s kit manufacturer for the 2014-15 season is Umbro. This is the first season in a four-year deal after the previous deal with Italian sportswear company Kappa was terminated early. The contract with Kappa was supposed to last until the 2017-18 season, however the club decided to switch to a different kit supplier.
https://en.wikipedia.org/wiki/2014%E2%80%9315_Derby_County_F.C._season