Foaled on 5 April 1904[1] at the stud of his breeder Edward William David Baird at Exning,[2] Wool Winder was sired by Martagon, winner of the 1892 Ascot Gold Vase and Goodwood Cup.

[2] St. Windeline was an ill-tempered mare that was prone to kick, notably injuring Theodore Andrea Cook and losing a shoe before running in the Oaks.

Wool Winder won the Alington Plate at the Newmarket Second October meeting, easily beating Hill Sprite by two lengths.

[11] The colt had not been in contention until the last quarter mile but then made rapid progress in the closing stages:[12] he was considered an unlucky loser, with Madden being criticised for giving him too much ground to make up.

[15] Heralded as a top prospect for the coming season, Wool Winder was unplaced to the colt Succor in his first outing at the Newmarket March Stakes.

[19] He was ultimately withdrawn from all of his engagements for the entire racing season due to health and soundness issues, his unsuccessful run in the March Stakes his only outing for the year.

[24] Wool Winder stood at Aristides Baltazzi's Napajedla Stud in Austria-Hungary (now Czech Republic) alongside Matchbox and Wombwell.