Hi CanadianCathlete, all bands provide resistance throughout the concentric and eccentric phase of an exercise, but different bands come in different lengths, resistances and have different elasticity.
When you compare Boss Loops to say our Firewalker loops they both are loops that are mainly geared for working the glute muscles. However, they are used in different ways and each has its advantages. Firewalker loops are mainly used around the ankles which place more stress on the knees. Boss Loops are worn above the knees and hence place less stress on the knees. Our Boss Loops also will not roll up or pinch your skin as firewalker loops can at times do. But for some exercises, Firewalker will be the best option while for other exercises Boss Loops will be the best choice. The same is true for free weights where a barbell is best sometimes, and dumbbells are a better choice for other times.
Boss Fabric bands are really a big 40 inch per side loop (80 inches total length if cut) and hence make it possible to do some exercises that can't be done by a non-loop band. Fabric Boss Bands and loops are also less likely to irritate your skin and are more durable than TPE or latex bands, so you don't have to worry about them ever breaking.