A convoluted boot made of a resilient material has a first collar with a large diameter and a second collar with a smaller diameter. The collars are positioned on rotatable parts which are rotatable relative to one another in an articulatable and/or axially movable condition. Also, the boot has a guiding portion positioned between at least one first freely deformable and movable fold and at least one second freely deformable and movable fold. The guiding portion is angularly movably held on a guiding member connected to one of the rotatable parts. The guiding member, on its outside, is enveloped and defines a spherical face.