At 26" the Lex Loop is the shortest cuffed product, making it ideal for smaller range of motion isolation type exercises. The newly increased cuff size provides a more secure and comfortable fit for all body types. Very Light (Yellow) = Beginner Users Light (Green) = Beginners to Moderately Fit Users Medium (Red) = Moderately Fit to Fit Users Heavy (Blue) = Fit to Very Fit Users Ultra Heavy (Purple) = Extremely Fit Users