Isomer is a 9 year old gelding and has raced from 2016 to 2019. He was sired by Cape Blanco out of the Speightstown mare Nimue. He was trained by Andrew M. Balding and has raced for Andrew M. Balding, and was bred in Kentucky, United States by Mrs. Fitriani Hay. Isomer has raced at Ascot-GB, Ayr-GB, Chelmsford City-GB, Doncaster-GB, Goodwood-GB, Haydock-GB, Kempton Park-GB, Lingfield Park-GB, Newbury-GB, Newmarket-GB, Newmarket (July)-GB, Salisbury-GB, Sandown-GB, York-GB with wins at Ascot-GB, Chelmsford City-GB, Salisbury-GB. His stakes wins include wins in the 2018 Classified Stakes, 2018 Handicap, and the 2016 Maiden Stakes.