Fat Mattress was a British rock band formed in 1968, known for their energetic blend of hard rock and progressive elements that captivated audiences during the late 1960s and early 1970s. The group gained recognition for their dynamic live performances and appeared at major festivals including Woodstock, where they delivered a memorable set that helped establish their reputation in the rock scene. Though their time together was relatively brief, Fat Mattress left an enduring mark on classic rock history with their powerful musicianship and innovative sound.