Our Classic Black Define Band has an adjustable strap that is not removable, and is permanently attached to the back. Our Define Band With Removable Strap is exactly the same, with a adjustable strap that can be removed from the back of the band or later refastened to the back of the band via Velcro lining on the strap and on the back of the Define Band With Removable Strap. This gives you more options on how you can wear your Define Band With Removable Strap.