Because as much as as I love the idea of the flisuit and De Soto products have their place in my lot of training gear, the quality and comfort of the material in my Ownway Apparel Trisuit is far superior than a Riviera Trisuit and zipping down to the waist and then back up while running is pretty easy. So if the OP is simply looking for absolute easiest pee solution, the flisuit is likely it. But if OP wants an overall better quality (and probably faster) Trisuit with still good bathroom options (in fact better bathroom options if #2 is needed), then other brands offer what I think are more compelling options.