Chesterfield have signed Middlesbrough goalkeeper Zach Hemming for an undisclosed fee on a three-year deal.
The 25-year-old came through Boro's academy but never made a senior appearance for the Teessiders.
He had season-long loan spells with Kilmarnock and St Mirren in the Scottish Premiership and played 10 times in League One for Leyton Orient last season.
Hemming will compete for the number one spot with Ryan Boot, after he extended his contract with the Spireites on Thursday.