Flexible chimney hose liner

A flexible hose liner comprising:

• a cylindrical body extending along a longitudinal axis from a first end to a second end;
• first and second sleeves forming said cylindrical body, the first and second sleeves being formed by separate continuous ribbons having a plurality of convolutions formed in a helical pattern along said cylindrical body from said first end to said second end, the first sleeve surrounding said second sleeve;
• a ring formed in each revolution about a longitudinal axis of said continuous ribbon of said first and second sleeves, a plurality of rings forming said cylindrical body along said longitudinal axis, each ring having a first convolution and an ending convolution such that a mechanical connection is formed between the ending convolution of a preceding ring and the first convolution of a succeeding ring, wherein at least one of the mechanical connections of the first and second sleeve comprises an undulating crimp connection, wherein the undulating crimp connection comprises two convolution sections crimped together at a contact point that is formed within an undulating crimp of the undulating crimp connection throughout each revolution about said longitudinal axis.