The harness of some strap on dildos can be a (pardon the pun) pain in the anus. Those straps never fit right and everyone complains that they are hard to adjust, hard to use, and uncomfortable. This product addresses many of these concerns. This item is a slip on dildo. It is worn more like underwear so that it fits snugly. This is "one size fits most" type. The Slip On Dildo is quite slim. It is 7 inches long and 1.75" inch in width.