CONNECTOR

According to an aspect of the invention there is provided a connector for connecting inner and outer layers of an apparatus, the connector comprising: a first attachment part for attaching to one of the inner or outer layers; a second attachment part for attaching to the other of the inner or outer layers; wherein: the first and second attachment parts are connected in such a way as to allow the first attachment part and second attachment part to move relative to each other when the inner and outer layers move relative to each other, and the first attachment part comprises: a first flange portion adjacent a gap, said gap for accommodating a portion of said one of the inner or outer layers, said flange portion retaining said inner or outer layers within said gap, and wherein the first flange portion is substantially dome-shaped.