The Cambridge is new and improved!! We’ve re-designed the backrest to give it a more supportive design, and re-sized both models to better fit more people. The PR401-SME is the small/medium for people 5’1” to 5’6” and the PR401-MLA is the medium/large for people 5’7” to 6’4”. Both models come standard in six luxurious fabrics: Hazelnut, Copper, Sterling, Shiraz, Calypso and Pearl.