The bottom hem bar is the "track" on the bottom part of the roller shade (can you spot it in the picture above?). This is an often overlooked detail that can make a big difference in design and functionality. Each kind of bottom hem bar option has its own look and their functionalities differ, however, some hem bars are better to use than others in certain scenarios. Here are the 4 options we offer: 1. Heat Sealed Aluminum Bar: This is the most popular option because its a c